Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2aa34a3b1fb580…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 10:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31bef05792d0f7c653e43e398375b1ed SHA-1: 5fe1453c9937b9d23a631712c0233aae431087ac SHA-256: 3f2aa34a3b1fb580bb45862e5c4e075d42a990165cbab4fb6d27c46a26d8b0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://grawerlik.pl/userfiles/file/ravorovolovedisevese.pdf In PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/subivekebojibodasujo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb54e73975b---gebunevumixenefatemul.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/ledufowaf.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/97482300705.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/46247922272.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1u24ufk60nmfp0pqpnn8uo9i75/lolikusukolox.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/81762783806.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887b43ded4---13958014959.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ljc0j7blnqtsq7520jr60udc64/75507512748.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727cdd155ba---batafamekatavapejejemonol.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/63d3c41223186129b9fc4192eb68f3f4/66079070449.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/pesamujeresonuze.pdfIn PDF document text
    • http://winso.tw/userfiles/file/43067765906.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/66da82de73e8acd0390bc304464da2b3/vujajowu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/wobesubikumenogizir.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/7e781f06d413fe46e3110c1959b9edec/bimerefitiwilamutotojinur.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870cb0dad9c---95441031990.pdfIn PDF document text
    • https://arerp.kr/data/file///rezanujugavur.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/56407495585.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/34260246157.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/397d04d2805891f1b09709cc9f08011a/sugosibuzubiburibigularox.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/ripomogix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pulverizator+manual+dedemanPDF 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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 10468 bytes
SHA-256: a58ea693ec041f114eabadc1e73aa71ce9e76dea092f7da4e6a55bb80c938f04
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 17284 bytes
SHA-256: 939d124e00ce125ad38a26aae4dbb8373ce6a22c7acb0311976866883ef5074d

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