Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3c1a3aae5131bc…

MALICIOUS

PDF

95.7 KB Created: 2021-09-14 04:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 263887349a44c4e697323bd1d19e3a72 SHA-1: df80e282847367e88018ae996ed15cce87d583cd SHA-256: bc3c1a3aae5131bc9cdb7590998bdd32ba1fbbfe11ee700358fb02f6f2f11f4d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://smidgel.ru/uplcv?utm_term=truecaller+old+apk PDF link annotation
    • http://automotiveenergy.cz/userfiles/file/vojarunilokupu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/79533158368.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/zukakebavabamawulodig.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/93125537536.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/27762973415.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wupugajikorisuzuxebulo.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/wafuriv.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/65880586952.pdfIn PDF document text
    • https://kar360.com/resimler/files/zaroxaraxusisijikukabivu.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/85436570883.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210913122059.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139eaf4d5265---ribajevadozazevanob.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///judipuxuv.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/famokozilulomu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/nubudizavabanurokebelogo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce37944e2---ritevedij.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4f1edac9---44675204143.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/tomarabobemeselavewapel.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/67936963341.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kezenepakojavitekolevuru.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/45720008925.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/94351765390.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16132a54f07e9d---65303850669.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/33226231620.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 10200 bytes
SHA-256: 1429dbb6d615b712e2127522c1bd3b1fee0395d7bd7cf58789d9497664cf0b82
font_01_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 17652 bytes
SHA-256: b72710ee03c046028713294c31599160554408896ec13719dfd447f44b2aa0c2
font_02_sfnt_off0001596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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