Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a5d1e73c891aa8…

MALICIOUS

PDF

169.3 KB Created: 2021-09-03 07:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5453018153229dc72394b65b5ba4290b SHA-1: 138ad8f9745c7be92a9d657fae118c823d0eaed2 SHA-256: 01a5d1e73c891aa8c5d69db4da723f2075b3ebfd0fbaeba2c85e283aacdd7604
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is flagged as a link farm, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the PDF and its embedded links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=dostojevski+braca+karamazovi+pdf PDF link annotation
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6204d3d688538c2bc17d785abe0e7d6a/64420580353.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d5bcf855ec6d152339accdae896f62ec/19866556339.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/cc4a36acfe6a009f6ba60d7b12618ed1/titolagodajusiverofiti.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e5d78861---18784347220.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/ziraposefobajiwojuxekobag.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/mawoxefedubanexew.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3herdu03sr6dj6fk7nvqv9jt8n/61466703856.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b077c6068b4---52136584839.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/warokuzup.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c81f4847b---gevirikisepurivevo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098396aa0ca9---37795274001.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/54561469638.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/94f43b5c70eca06a9cc6d6648c2ad821/vixiwop.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cccac6f38---39870152574.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kovej.pdfIn PDF document text
    • http://klpa.net/userData/board/file/43666550549.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210821082411.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/22919869047.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da8428325---fafatu.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kefifofekugegibosis.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fafb767c25891c1fa4356660813112b8/naxure.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C26 22852 bytes
SHA-256: 38ba83123fa791ab36ac51abc22db9904fedd3dac674fa33b7d02dc23ec21742
font_01_sfnt_off000245e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245E0 11120 bytes
SHA-256: 3d2fbd37b05ff9fbfdfbe6d58838a0f0240b4c978a5de534dc9d40a2ddf03d5b
font_02_sfnt_off00025fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000277c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277C8 16228 bytes
SHA-256: 6de2e4de3e01fd5ed443d1209e1dacf3a9d2e38faa1ffa722a59a0423b67245f
font_04_sfnt_off00028d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D99 1872 bytes
SHA-256: 7286ebf10b6160c9da72d5fc3cf1f7f2560605c729a3ae36a169f4463a46d3d5

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