Malicious PDF — malware analysis report

Static analysis result for SHA-256 024df554116f23bb…

MALICIOUS

PDF

112.8 KB Created: 2021-06-29 16:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c247edb0c224c2b5403c48eb8b2600e SHA-1: a6a56dcd59327846c237a1e0eebae3245fc6458e SHA-256: 024df554116f23bba82ed104fcd332a0ea5251523dabc56899f2f6ff1f3d5e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://igabana.com/upfolder/e/files/20210627102116.pdf In PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/37845311875.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/viwegefisorulonu.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/10944438394.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4966ea1e1ad179a2d912e89b3c0e2a23/zizisemetibewenifuvafir.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49d90c255---95173690132.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ono17vu2gb459jok3p81gqrikg/99987724935.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/dabolexozidififezipisefe.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1fc155ab9---palisevuzikelunopo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/sokit.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/12134266019.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ttah9uh53e3icvknm3knjq10mt/watoxewimalanazamegosibi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/47mqgavg5ttsoqjel9hpembr3o/17729084306.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4fc7ecf61---favopajab.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e50ffbbd292d1750c5dbcc4299eb01e0/94955251577.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/o61rlpdi6da3bdi0lkg9u4kf1l/dodapipiv.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa826a56a7---jaribobovutowexojibewen.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/42835679922.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/706dce242f49021c247e13eacc692af8/27866416916.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/32bk2iqlan3surkdbq8ud1ei4b/30497171241.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/de5bfcapck2t5d774m9a8dpm8e/6905240907.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a61dc51e8---pawumagadaw.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/167fabc2dfce34d4ab1666a226f7188a/18237623476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=interactive+clinical+pharmacologyPDF 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_off00015761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15761 17580 bytes
SHA-256: 0608fc0b48ca1b5b0962125bda243ceee3bbd0e5b29638d90a3f13284bcc5ea8
font_01_sfnt_off00018547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18547 10784 bytes
SHA-256: 01934603ccc7bcf4a95abb76d7dbceebe05e54e3237bcba61be67d960addbad6
font_02_sfnt_off00019df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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