Malicious PDF — malware analysis report

Static analysis result for SHA-256 77335591c2bf51f6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 06:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 937e4acba48a6c8eb4c4743dbc85f400 SHA-1: bc08f734ccc7172c6a9e873e72367d4ce6c8f97d SHA-256: 77335591c2bf51f61ef603265965dd260b4ec3426f43982128318d6acb4f0d74
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of multiple external URLs, some hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number for a fraudulent purpose. No scripts were extracted, but the PDF structure and URLs are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=can+you+facetime+on+your+laptop PDF link annotation
    • https://weishinclinic.com/uploads/files/202109102006395780.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/41257464310.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/denadux.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/45084868379.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/25b3abb5bb806760d57ae606a42c4e05/zasozudofunod.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84487984895.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/78828625823.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/zofipoxogex.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5ca6ef61---zorubonikuxep.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/dufile.pdfIn PDF document text
    • http://vhz.cz/user-files/tutoragusopezederu.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/farapufukumaduvomajevitij.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/fenegobo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/61691491642.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3118_20210919043155.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/361b6188d74a87c590ecb246a3a275cd/6888977617.pdfIn PDF document text
    • https://codecs.ro/images/file/64477105939.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/78980776831.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/pejarilexedamos.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/rusiwumuf.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/wuxuvuwe.pdfIn PDF document text
    • http://scsychem.com/upload/files/93955201849.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/jexanojetomox.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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 17224 bytes
SHA-256: 71882b8c352208822395bb3b7a7edae48493cc7b5a5d495c02dee657a025f140
font_02_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 10716 bytes
SHA-256: 0f9ebc7c82e1787b6ae73f74846e9d9c1564f40775cc5d814342ab53cb4c5d16

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