Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dff8fa67eb5d620…

MALICIOUS

PDF

75.8 KB Created: 2021-06-27 12:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a04e06844fb04683ded6622ec78a35b1 SHA-1: 4d4472651cff57dfb8d5dc8973317d7c430406d7 SHA-256: 3dff8fa67eb5d620a039ac33cef81303c5967e57dac4c47ab2ef5dfe0394860f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=tag+office+in+mooresville+nc
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/78635f030e24ab3c3f1145d9760aed49/giwafire.pdf
    • https://noddy.nu/images/file/wasaxude.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/nudagegawimedufu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d9a659a4---40007285188.pdf
    • http://laweasy.kr/userfiles/file/96615160437.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4a2d2ec68cdd2c2f0f56a6fa0fb77cc3/65215891802.pdf
    • http://cesishotel.lv/res/wysiwyg/file/difarixujarituzadob.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31c1d6e62---54612483280.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac53854ea---gufonuwobimikagoxibara.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608328c581660---54644511754.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2d1253f3bf390739e19a179de03f6d39/95803681263.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84579494b---xigabemuxijoxonidej.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2007e2775ba82ceca5ddc3b973ebf0ba/xoxenoridumakifareleson.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mmrorp5btpqsths35s7kmfg0ig/94131415807.pdf
    • http://brenna-ski.pl/userfiles/file/6152856808.pdf
    • http://jjmcp.jp/userfiles/Image/file/7429971343.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bdfeb17671b0416c54ca39eb9a2cb473/99621590899.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dd0ac89f96b53fff045ca906b44aa1b7/wetejoge.pdf
    • http://mhinflatable.com/upload/file/zozoluzavodoba.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6046f3de---rejulidunipumalogoti.pdf
    • https://mk-sito.it/uploads/file/93791695962.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3b7004cc144a97d5d0dfce148ee61ebc/xowef.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565a8c194b---guzogegimexiwinotumegisu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cb242efa8---67952415335.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d103de334b7bd55560a8b97ec1259df/62642793628.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c493.bin
03aa2666b367d4d48b661181ee74331a26a98c6b252e792bc6d85b1af6509a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 16984 bytes
font_01_sfnt_off0000f1a0.bin
0893eea5f491d33eaa279e8a02e123be43c7b0f60edce5b50b29f8b9b740eb9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10612 bytes
font_02_sfnt_off000109e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16792 bytes