Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef33d536afb054bb…

MALICIOUS

PDF

68.9 KB Created: 2021-09-03 10:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f209e7bc1111679df8f4cc9bbb095044 SHA-1: 09780714d5a01dbeefe9ac34d2d52e1665bc01b5 SHA-256: ef33d536afb054bb48782e54e8f5e9f4c913b71a3ce578883bf4716656f2e445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b150632c---vosaworulegenavadazaxo.pdf In PDF document text
    • http://dgjst.com/upfile/file/totulefinojipaza.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/17274087695.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/47431228953.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/200723011585.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/088457320eb940d9a70e17d93258e36a/rajude.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8tf2ie6k61lhgom2q6f53fopr6/petobefupa.pdfIn PDF document text
    • https://chp-travel.ir/data/file/saratederabudotil.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sdrf8eohv7i44lrpt05rgm70j4/8563090549.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085e5a0015e---29769038750.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a922c243fef---18062584880.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/parotuwudibosenojalojovo.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/suvox.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f24435140---repatukapizipususiba.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/30309171856.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/mukilujojo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac49d0dbb---zosigonix.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a61d7e013---86517775665.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7171c3262---49892755922.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/df5ba9fcfad11c71d4c9566c99dc7a0e/vovorasubabajodulijuv.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/kijonaxaxe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3ecb57427---fejapakuginovumoga.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/jogesimifetadozilidorum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ge+mac+1200+service+manualPDF 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_off0000b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB212 10672 bytes
SHA-256: 792b29529c3e529f27a624e86b6bc052e13d80493e496defe60f2a47aa1b8a60
font_01_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 14292 bytes
SHA-256: 61253a9b4e5478b181384358c77cc19cae1fec4c51f661206cdbd09f4fc6af63

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