Malicious PDF — malware analysis report

Static analysis result for SHA-256 4182aabcc5aeceaf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 04:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae000e26a4ea3aeb702a245c84575e3e SHA-1: 692e1014501ee49bbd7914864d6703c543ae3d91 SHA-256: 4182aabcc5aeceaf9032518cf01498d52ddc1e3bd250632b6050a3e4cd9f8794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=xtreme+motorbike+apk PDF link annotation
    • http://matstravel.ru/userfiles/file/dexofogamoxuxemezu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/603fb23bedcae4ab71e3de443736c732/gakolilifo.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909092719240.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/notobasalapilagujobamafo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/64652755843.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/33423345272.pdfIn PDF document text
    • http://darec.sk/files/files/taxataxulezewititazuma.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/nufepifuvawajuzuxiti.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902043656.pdfIn PDF document text
    • http://szm.hu/userfiles/file/98862079072.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mabulenamuvomob.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/pubadakimera.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/68383161616.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/38377137814.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/62946385706.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d5152247f---renaditetajoru.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/gadomabanolefup.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/vozolugis.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/69775957584.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/54164046239.pdfIn PDF document text
    • http://pedraferro.com/files/files/14022824869.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f68c9f76b---lamabadomuliwunexumexak.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/99348968122.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f3569a0b57edc9f4c1e15de729599c7a/menemejokasulitulunimubab.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10332 bytes
SHA-256: fe968d3fd7d4e7cf253450a5538be36a6c8bd60c7822933b8784b8bf556cffe5
font_02_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 18712 bytes
SHA-256: e2255517cf29388d631131f0677cc1071a90f5f4c2a34c75a839eaa02d17b2a3

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