Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b890435816c2cb3…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 23:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7c331e04b409cd38d2e52ffc2913a0a SHA-1: de4211312e1d63d5170e33ea21809a0a8655a7ff SHA-256: 7b890435816c2cb38ab6d67275abc818b7b80d1f7154b7bf08788cdbbd1c584b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple distinct hosts and a high number of links per host suggests an effort to obscure the ultimate destination or to spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://olivierdaulte.com/ckfinder/userfiles/files/dopelonak.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b96c094---31827321062.pdf
    • http://gyobel.itpublic/file/39749267631.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/jodatejefukigar.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3t2i7a2me6s40u115ccocnc6u7/gagonajutatatezikolew.pdf
    • http://banghaija.com/userfiles/file/84817169519.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7feb19f2592e55db521e0aeec928a3c4/dovinosewunavomotuko.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd6692f48---51511207681.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b7908f01e8631ea1042cfce746ce4000/19602947255.pdf
    • http://cephedanismani.com/images/pages/file/ropebudozimuluson.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7060175c50ed2f211cc8d53ea9b11f3a/sunafesekexelonojozi.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5gqjgqbms003lbt5eolbta4ofb/85743990138.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f52bb2fa---kemefebezugubip.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edc4b8f325---wibuselofevosuwunevidike.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/334541a03348b7917c642457fc09d839/9864899742.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aae5341e5---33649904298.pdf
    • http://amuseonline.com/absite/userfiles/file/xikubinipewejitofisolava.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s8qs197qrgsenq2dpfc0es2r7l/48736922494.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sf4agnuvsjbiacnfgo82r202d3/guduxobisarew.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074aefbbbc5b---35414800814.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af942273f1e---piloratid.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/detafajuvivamonataku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=you+are+the+answer+to+someone%27s+prayer
    • 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_off0000f440.bin
fdf95a4b291f9ade1fce3ff9bbba9d80e8596e3d1cc96fa03f28869ccf60bd24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 17092 bytes
font_01_sfnt_off000120a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
font_02_sfnt_off000138c0.bin
b79defa0e27bc72b06d251f0242e901344a921f7e93dd16753748bdac8a25722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 10696 bytes

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