Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7510a2cfee1aa88…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 12:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0b23fac8ca10136c052062a2a5a463c SHA-1: 48ad7796ad7668f12ed1fc151e2deeb9ed221d55 SHA-256: a7510a2cfee1aa88c060c0bdfc43491eb71e4834a7730bbb3403096ab405b143
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised or disposable domains. The presence of numerous PDF link farm heuristics and embedded URLs strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agisinfo.ru/uploads/content/files/82214967756.pdf In PDF document text
    • https://swaarm.de/app/webroot/upload/files/rinusimatovokanexoga.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/renoke.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/73171887220.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5dfea9c4e6a1c82c720259017e39bf58/pevezukewu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/70413238826.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/lifarugizojunileto.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/texosafomotexejugiv.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/tuwul.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65377be77---53093957799.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/darefajesewivewi.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010607543911.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/dudigujiwadumawusopiw.pdfIn PDF document text
    • https://pmms-online.com/assets/file/99526673643.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/bonumitasimadep.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/kobafilugagaderorot.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/edff953455fe3940ac14cca05235af24/68049731798.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41a5bee33---27324621820.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/vudimeme.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613131a8eafe7---18558020702.pdfIn PDF document text
    • https://activepymes.com/pub/file/40644070820.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca72d706d---56831254424.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/vugidijatepin.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/farorak.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0f44e0c6089081378ff7174cc953e18c/bebuwoxunirudonamasuxa.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210912_E900E7AF6017244B.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73875156552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=roblox+wild+west+cheatsPDF 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_off0000b795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB795 17316 bytes
SHA-256: 23c8ae525f6b48068d4f01ed2d7760d81e83f1a25945fbe32ce956f98d83f0b7
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10636 bytes
SHA-256: f5c171a9e885db7edb357854f2eafb1a83fe5461b77bbd274cfa2f12fc43f3f3
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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