Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e477804253de1d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-24 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f2cf55603864ead3c9c0b3458b91a90 SHA-1: a6b42de50adaa3954723925fc008f575af896f02 SHA-256: 81e477804253de1d354674fc4dffdda6ad23024c2e8d29856194ad3beaac6d10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document body is heavily obfuscated, but the presence of embedded URLs and heuristics related to link farms and callback lures suggest a phishing or scam attempt. The primary attack pattern involves tricking the user into calling a provided phone number under the guise of a billing or security issue, likely to extract sensitive information or extort money. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+much+cost+to+unlock+iphone PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g1t6ekta0cpo053rh4j90ivpb5/45732432987.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/92238460621.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/vimowajutumi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c95244410---46135954427.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/45855219377.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90de93f5d---57758717240.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202199205499901.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fbf10ffa46cb6289b08116133b859a71/78183933412.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/59258410279.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/4596075730.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/76922380050.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xosisoz.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/29946894432.pdfIn PDF document text
    • https://istanajp.net/contents/files/bezim.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495d97123fc---potilopukixijidosewepipe.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/73072901678.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/doluzexulopodomojika.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/36368353630.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914110101.pdfIn PDF document text
    • https://dance-lab-new-delhi.com/userfiles/file/zuwuzimeranogipuvo.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/63502957416.pdfIn PDF document text
    • https://makenie.com/upload/files/19195980943.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/72673074011.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/23055049830.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/16048313929.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/11850608580.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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 10644 bytes
SHA-256: 714e573c1ab96e8d1f56a60525ca72710b01fe52fe5f1f48cfb634e8c4ba12ff
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 17892 bytes
SHA-256: 96b2ea6f00bf631ad89c209448256a50fbeab9b9ea014e8edc0c29f772df398f
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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