Malicious PDF — malware analysis report

Static analysis result for SHA-256 674a5773b5ecb324…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 11:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c6b2703704de0ea72cedd5df6f5a5e1 SHA-1: 6cfd6a462f411c3e806ad42e01baa27af852fbad SHA-256: 674a5773b5ecb324f8df76266c559792adf2818cef06cf2923c5d4c1896faaa2
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3bbe1d400---28565899548.pdf In PDF document text
    • http://constantcontinuity.com/membership/data/files/31731224509.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f861693f3---xivum.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e69d8553---7154498184.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/gedimesowaxazediva.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/73383327410.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/zefasijewipuveduj.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210908202335.pdfIn PDF document text
    • http://aprt1day.ru/file/69476122877.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/womeduvawuvub.pdfIn PDF document text
    • http://ymmicro.com/files/files/xemopawetixaxudezetano.pdfIn PDF document text
    • http://shesob.com/file/files/57767906887.pdfIn PDF document text
    • http://hjhchem.com/upload/files/57952913046.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/53019678885.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613222b230331---55462164682.pdfIn PDF document text
    • https://airbays.com/userfiles/file/vununaluzizajur.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/81448303365.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/80849174550.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bavige.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/72qi2co4b1v3q3pqgevgibc74h/jerufekesulemesalan.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2eb55204c---pewigewefaxojedomapuz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59ce1361---19891045507.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/liwawo.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/gosowipelikogebo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/89335055633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=background+image+for+android+appPDF 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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 17772 bytes
SHA-256: 0ef9e5cd1cdb3c7694346f32ca4a6280763f1c190824c22fd19be857d9e2183b
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 10896 bytes
SHA-256: a6133d8de69b2bbcfa44b188f43d4e0f5443353b9445af1f0f3ec6c0d0e56771

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