Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd8d65dd6755555…

MALICIOUS

PDF

90.5 KB Created: 2021-10-06 01:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40b57e78de200b12ace793316a584e13 SHA-1: f94a34669150af8ebc0c80e5b49039c902c09d7b SHA-256: bfd8d65dd67555559b45c1779dc6d2884210652b37d41b1282a46aed0da839e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and a callback lure, prompting users to call a phone number for fraudulent purposes. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a potential for further malicious activity, possibly involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kaskad-74.ru/images/uploads/57073382506.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/41237748792.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/67506410725.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/dikaguxi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3b647207---xakoxi.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/42604471135.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/vozorizizewinipatekotexe.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/78691049352.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/2601056380.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/fileziduxevor.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe1d28ca13885da582f3dadd5b99eda9/47614935157.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422b0009cb---wevezafokusupi.pdfIn PDF document text
    • http://arucax.am/user_images/file/favojiduseziwidajuses.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/zenuxarufof.pdfIn PDF document text
    • http://one9five.com/userfiles/files/romusonunexotidifesolovej.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/foxukoz.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/50168107318.pdfIn PDF document text
    • https://airxps.com/userfiles/files/13490346679.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/65485969441.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c94e73b228---gagirironuludes.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/xitesaxovumikibujoz.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/5382407637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+weather+cheat+ps4PDF 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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 20008 bytes
SHA-256: d9aca50a42079d550ceae1834859fe5b425da8e196020595049106f594431431
font_02_sfnt_off0001447c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447C 10448 bytes
SHA-256: b79e0161abbf894eccfb3ccd8130a35849d65392248c10afc49f4a4d8487efe9

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