Malicious PDF — malware analysis report

Static analysis result for SHA-256 349eca8b8f95c220…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 16:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85377ddcf1e03c948564847a7cb954e4 SHA-1: ed75dc5d553ea518c4f914ab49016c3e497745b3 SHA-256: 349eca8b8f95c220bdb74d57cb9d8cf46fac4b3eea4790b3dabab087cbaf8965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, pointing towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/uplcv?utm_term=play+store+download+in+windows+10
    • https://krainaogrodow.eu/zdjecia/fck/file/lapuvowimigidowadulupe.pdf
    • https://buzascsaba.hu/userFiles/file/kuxawevubawefogelarebub.pdf
    • http://djpress.pl/Image/files/luranenanabewo.pdf
    • http://crabandclaw.com/uploads/files/momisoperaxol.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/20726cb595b7d8a8cd69e8c8e46ecfa9/40690854030.pdf
    • https://kheops-so.fr/ckfinder/userfiles/files/41262042085.pdf
    • http://chengzechem.com/upload/files/74352987021.pdf
    • http://mijn-nederland.nl/userfiles/file/62474786046.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a78865035a74f34a4c55bdc02d389c9e/xaruliwipibaparapekigexa.pdf
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdf
    • http://cssh.es/img/file/43618809052.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c7e74e67af4a25ef98f07f1bf28a5ccc/tikexu.pdf
    • http://soundspace.eu/Upload/file/falabuw.pdf
    • https://xn--nmqu14inmf.com/upload/files/41375453966.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapatesivij.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/26750640691.pdf
    • https://cplastik.com/data/cms/file/15581926577.pdf
    • http://ruben.pl/ckfinder/userfiles/files/28589990842.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dc0b240f39d406275fa90fc2a2df2d6d/xanuvigebinusegufimorime.pdf
    • https://drlanda.hu/user/file/tawogulaselez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d194.bin
0c685fdb4b464ec98ccaeb41be9a1c1729944a2485855c43abea82048d475cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 10616 bytes
font_01_sfnt_off0000ea1f.bin
360f68c91eec50a0bdf40c407d87ca0fc3f3de9b42991f3cc15446dd2781e722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 17464 bytes
font_02_sfnt_off000116f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16792 bytes

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