Malicious PDF — malware analysis report

Static analysis result for SHA-256 b416aab4232afc43…

MALICIOUS

PDF

95.8 KB Created: 2021-07-17 03:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4e1ada9b7df801be49e41c4112c3e89c SHA-1: 7c6c46216ae3a8321e686bd62d56a3a7686504c6 SHA-256: b416aab4232afc43e00940715be8118fb537e1bb16e6ece32e7aa94b74226e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc999abd18---87603258353.pdf In PDF document text
    • https://pacie.vn/web/uploads/files/64359433043.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/roropelaremalo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1d5f2354---70279310641.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/597275a499cd133b5c670df45ae26141/litorixufeboruru.pdfIn PDF document text
    • http://ridendo.cz/files/file/warudufobexedenasukoguf.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af78552c2f---lenapisilebubis.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f303d89a4d61ef4c021bf6b76ff37595/fawatob.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8dde1444---16970351578.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/8200902432.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/67244493039.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ggbt44bonfn1c1qgsq1e3id9e5/zarufederebo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/dd54804dcfceeb80aa5128448e0173c4/51979888127.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0bfd0128---lusosomadetolexuloxodef.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aac4b8b775c101e15aa1132a515f386e/64471191369.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df80b28b67---jeroropopadedisosexuget.pdfIn PDF document text
    • http://congtyvima.com/images/Download/jewevitetuzukegapuji.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc5fac6b5a60a9c20bec9f3ad3d32343/wopidijasazazuzalifaxop.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/55e11fce9b594577d20604e276d94413/80382203012.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/66227527143.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6m56l1sdqiventspjo6vivae33/74578962763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sparingly+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001512c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1512C 18456 bytes
SHA-256: a3e04e2b44fab45ab223c20ee8389b6b5ae559c5e6b6d5e337aecf5b20cf00e4
font_00_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 24888 bytes
SHA-256: 48817302c743f69af09523ae0a8c663febd3343404bf16c8a0a23677463857e4
font_01_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 4608 bytes
SHA-256: a404e1c93861f87c37cdadf8f78d78f738f66c1ee04ff28803fc3f5a8cfaa9c3
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 10668 bytes
SHA-256: 9b58f0b04dbc400de0c5c35da2bc7a979c52ccd7c9e88624fd743fbe2f0dde51

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