Malicious PDF — malware analysis report

Static analysis result for SHA-256 a136b51be311893c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 01:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56d2adea6ce37acc5f792c3c628d3997 SHA-1: 811d16d8ad29f6e50eaed900635d851398ecdc6f SHA-256: a136b51be311893c1f9821d7baa45cb286264ac4b6ecc7ba69b78a52fed423b4
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. Embedded JavaScript and external links, some pointing to compromised CMS uploads, further support the malicious nature of the file, likely facilitating the delivery of a second-stage payload or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/nariwaligoluwolofamabifi.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/redipomiwubavikofolubopo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qshrh3khti2pil41smocfjf1qf/bifolitulibax.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/7427558367.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021919330152149.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/dudalojero.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/86547256909.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/77815683101.pdfIn PDF document text
    • http://royalgroup.at/tmp/sawazurinu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c3facd1c---76559551821.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v06aj9hqrh1cnnen78fh24230r/gazijeginogivoxu.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/texejixiravajako.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109040333491548.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/59307399373.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/68150274066.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dibuvijolinitevavar.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/45993321464.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144cb197d933---29821396524.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/garupuparod.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/66061414956.pdfIn PDF document text
    • http://orthopediedelft.eu/files/39790771439.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/3664999755.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/98d5f35a99e49b05d90e7a88bd8190e7/34724675883.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/94698028520.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/wodulurulorevutogoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=my+phone+keeps+showing+adsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10712 bytes
SHA-256: 131d85259d08cb0eb734d4316a4781d129c8c85f3b7df5956f991e08810da90e
font_02_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 17136 bytes
SHA-256: 9f6ec3846497b0f64944fbeb8f986eb3bed0de89f059fd6eeef3ac40da32824a

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