Malicious PDF — malware analysis report

Static analysis result for SHA-256 d182dc720b4b78e6…

MALICIOUS

PDF

106.1 KB Created: 2021-06-28 07:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 792224c496723fab4171f7218d25ecd7 SHA-1: 69a0ccce721949a9621b19118a87442bbade42ac SHA-256: d182dc720b4b78e6f1e3eb72c4a13c77cf54e91798c5495cb5d2dbfea4b529f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hotelgiottotorino.com/userfiles/files/zebenolisebedirajoxepujix.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/65140440891.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/namimewonemexafinoruz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4f43da1a87fd32b631def19eb5267531/kezobogupanelilarademuli.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004eda9862---valuf.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6ksujgomtqcb1tlttif3i7oaj1/64555794496.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6oe7qigbjfr58u809sgame7d45/dadedinedux.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074343aabdc2---60267057962.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609669f64019c---wuxuranoluzala.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/30309171856.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/48988805439.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160735a8cd2261---rerigavukorobodadef.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f49c91ed---1730140625.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f38e798174a98de477e25be390319ff4/zitozazarusazifusewi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317aef679---1521865313.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/53e31840e338cdfc91f46e37d639e1a2/kedepukatowikadobip.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e395eeaeae---bigilinujepedojavovu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980d5873e14---tefabudenixaviwifupesi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d3ed4daa3e63eeae90b8cd21394415d0/sopatukusuvibovukij.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/69fcab43960e835e30a40809e90f5a97/nowobozibusifasapekakumi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/92684423907.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092290571e19---15368733802.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oaov4qdfqql7h3tkbltv98f16n/wadarerupovagog.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080141967df9---19310608794.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9853258499---sejilitijazesiwok.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/219329190ccf8133f543ba730b6a400c/wasedavonukiturazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hamlet+act+twoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10004 bytes
SHA-256: 81deb1aaba9b426c3d5cdc7e7fe852703054a73ece1b2f22b24b9b14a4858f85
font_01_sfnt_off00013f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F39 17180 bytes
SHA-256: 2cc5ffec2361bdd8c655ffdfac3509e0313e6a4bb31c2f9e91e5f95a3cd30326
font_02_sfnt_off00016be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000183f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F6 16104 bytes
SHA-256: 37c4223d7c774cc946d04c327559eb726ea8f7eea2948b74050dfd2031625e7b

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