Malicious PDF — malware analysis report

Static analysis result for SHA-256 c405381b26835cd6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 09:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31dad7fa80e80c52e01e335d822ee0ca SHA-1: 436e36c808d25b04d66eea79e94933e3753b672b SHA-256: c405381b26835cd6d4fa9ee2e536240260b8a26a4b6091d68991e35e9fcc778b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on compromised websites, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://langeline.com/ckeditor/upload/files/megefunijelujotenufega.pdf In PDF document text
    • http://desushibar.com/userfiles/file/40505665835.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gonipimamupadakowoti.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666bcc2da7---74228077825.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/zuxisijejosobamim.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/bidikefupefilokasibalom.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ec65e323---28150351009.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/60817906525.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c328b428001---16747414562.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210623_002754.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/s9a9me0e69da0s8494et59e07n/kijupujuxufakefufa.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/tixodapalagonelovupu.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/64230740105.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/69385304967.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/orino0v2hmagegbjgeutcis5t7/woxuzulavupepaj.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemuditagodab.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/llksj07o09d8d1m5bfgmu6lqet/pajudoloji.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/neziwujutadon.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/52461271362.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161168cba66c80---65535538215.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607470109193b---59091635435.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/vadasakikidumevurukikix.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/31147989467.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867a52e577d---51554341341.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/61472146602.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/75cd4d703d6f6c6ce3e6663b51cacf8e/91664850799.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc78b41---zufuxafugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=existencialismo+pdf+livroPDF 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_off0000c73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73A 10932 bytes
SHA-256: 3a570a501d0d0418ce1789359c1e65d5d5a7898aae734e213019465e9ab45768
font_01_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 19144 bytes
SHA-256: 3fe4f1d90ed1bff98f97e127bf07076c4478069fd84cd89b44fe2fa84c52d248
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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