Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1931a05f4004944…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 00:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 842eeca5974b0f25367e04d771b0a71d SHA-1: 931c7f42e7107b763e184d0d3940898a10f92fc7 SHA-256: c1931a05f40049447b88588665e02b16d3fd42298a134f955f9d5c012a297917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised or disposable domains, likely to lure users into downloading further malware or visiting phishing sites. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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 http://artstudiodesign.it/userfiles/files/xusujamodidamej.pdf In PDF document text
    • http://savages.lu/imagesRTE/files/84356811270.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/79448573708.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/11148430521.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/rofanimonenejufawe.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/vasetu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf11eb9126---1356167723.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/dijikovutegobepisumeru.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/66163363769.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f62e9830263249feacb5125aed746de2/bipososutigopadetedaka.pdfIn PDF document text
    • http://erictex.com/ufiles/files/zosekisiginowaxuxatus.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/werikimitajigoxibojisa.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/felireranumoziwawosa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4576901bdc---tipadofabewifi.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sitimokepuwizikenurezesa.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/nitepisut.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a4c39f31---tefavapukabilabulevufima.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8b488bjpofgqeu8t5jd4j7d1bg/78471695988.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s0ksl1tuscevak5eth6n1cb7kv/fodamokib.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608773d7b4ae0---xedemepoxepis.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/sqafg4r1l6r7ahund2qmt9slai/davoko.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/53155600174.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/nenemirojepevudosamozutu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3691f1ab22bbf5487c96990021a2ab9e/wuxujuzazazedegivas.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/95442101372.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/65432282005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hp+laserjet+pro+mfp+m125nw+specification+pdfPDF 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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 17748 bytes
SHA-256: 9b6dad06d3548ed2f0a76a1b57fcc315f67719b356e9c52f83c416102383e34a
font_01_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 11296 bytes
SHA-256: f6e85938aa164007d32a69161acb4bab899f4e4044f127bec0e977ba84864d86
font_02_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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