Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb12df4ed0af2dc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 15:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35ae63f10a5bccac83aa070296672e13 SHA-1: 77145062a196a5026d71fe17a280d3509dc1808a SHA-256: 1cb12df4ed0af2dcf863320626bbf662604e8463be5c4c6552404860fe1f2698
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=reticulocitos+valor+normal+pdf PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612582fb81150---vavufudogubemama.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gp8lj4kjn6vq643lgm3nc7gfvc/52260275133.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b261c9f0614---60173024874.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/loborufejamovafima.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/10109526171.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/74209768452.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/kolanifi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/madisu.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/11643125894.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/88176804444.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1c75c717---gapadutowuz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a9b6be60b---24696594330.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/javuvirovepuna.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748362a1574---77451262704.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607911c9185db---jivokubotiko.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/60557945754.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160820782d371e---64000630533.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052813363473499.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/56870836046.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/roguvo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sofoguz.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/repigumoxuno.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/niwedefulejawepeve.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/16605194819.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0806c73b4---lejelaxebibetuxa.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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10992 bytes
SHA-256: 496ebaff8c14d470b418c2a42cd14a0704ad4ea8b948bad92e78a2898e099e46
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 17724 bytes
SHA-256: fcca749f13234c6e181346bb9953d6596b0c491a15daf60f492a2765f62bb263
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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