Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6e56576224ab17…

MALICIOUS

PDF

76.0 KB Created: 2021-10-01 15:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 44741d058cc5dbecf438a088bd30f667 SHA-1: d44b26a1a164025989c18dca790406e22421966c SHA-256: 7b6e56576224ab172b7351c8b0083bfffe205f1ff3fcfc4df09d1eea5462e2c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dopuskvsro.ru/UserFiles/93853428640.pdf In PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/towebuzob.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/16287082754.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d2faf2c7018935285ad50e67bf07104b.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zizaz.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vilob.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/47864878156.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/guvivobefis.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/resemazipanajepakikolezo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a845faeb159e04ef16b25c25639b7b48/guwevolofe.pdfIn PDF document text
    • https://limsurdua.com/contents/files/68926195006.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vapeduxadi.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/41194705749.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/zinidijejemekepafejoxa.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/xowurojozejobevutironegej.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/befoloven.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xuduwulosipazabu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/87967452519.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gesifizeliseb.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c8391fe4cb687292ebc7a0efb49a7f4e/51107794853.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/af3b88c4ce6a66dbbd726721ad85c383/48677971477.pdfIn PDF document text
    • https://eurotig.ro/file/latijowiwigafav.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/12q5frd2o0b52g0r07e2rrhnbu/52652665133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=world+war+z+game+download+in+androidPDF 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_off0000b9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EB 21424 bytes
SHA-256: b9acd2d30d0bf491106dcbd39e3d754355a098e83a75f8cf2b844d4a473228af
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10464 bytes
SHA-256: e11c719a93b49de81faae4b1ba518e362416019b464dd98627026cd616a2ef9d