Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1173f3f06c50268…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 02:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a1625056b504fe8dfec2b645b4ba6684 SHA-1: bfa04d42063af7a917d2be94c20b70467345a4e8 SHA-256: a1173f3f06c502681496dfb75b5d589acb752313580dc475c8bfc5dfb1d53ebd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://stinpo.com/ckfinder/userfiles/files/dodefasititudiwexok.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/xigaronupuxekeje.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3bc876fa839d1060f650c0817fd86b7c/bazijonig.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/welaxewe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2eda44099---51491370041.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gilurukejisukudonusipas.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tifukopigekikelekud.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210830_DC27814B2A5F6B01.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rizupodeboxetuguzeroj.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fajosabutarenizisukugokej.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/rojobopibalinadufitul.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609982c4649ba---vasubajodiruruwixusumena.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6ba9ec07f7f06d0a2dd4e0f069155cb8/71966893724.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/754ea57bc6270d3fac06a4de34a2fbf0/kabitiroxavab.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/56272789538.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d3408b73c---bupaxojujagibirikateti.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/91493100862.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9e3031de---zaxokusefu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/dakapozowuvi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2148a65048---33299502357.pdfIn PDF document text
    • http://eternaseguros.net/files/files/fakogetafobibowirirub.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/34885477358.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/penexeliwusesutejavalaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=a+custom+audience+is+a+type+of+remarketing+listPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/pidoravoneze.pdfIn PDF document text
    • 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 11248 bytes
SHA-256: 498dcac55945facc734d446e201e124ce1bb9cbe9451a880f7a494b42ddd6f8d
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 17324 bytes
SHA-256: b99d18b7055f8d1a7a707934f2a8a1508c6e33b1f2b22ce66e22f9428f2a556e
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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