Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a3915c1d21b00…

MALICIOUS

PDF

90.6 KB Created: 2021-09-15 09:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac0a6d243a51cebfc9cf1779a223ce4a SHA-1: a2b1171f3db3732b945ef320228b6df99fe224e2 SHA-256: ad1a3915c1d21b0066559404049a66461a56678e124b48837efd724217d5e5ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://alharithiforcameras.com/ckfinder/userfiles/files/85121686431.pdf In PDF document text
    • http://haustechnik-hagenauer.at/70970875194.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/73690923775.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/bumopu.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/73166567701.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sajiwigeg.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61400ab5eff17.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165cbaa493---xezunozovejorijumute.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/momuzolirerobovazoxorawo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fd762a1c---52005643089.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/26bf80d45fa8a76ecaf30bd2b5396bf3/30864437652.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b58ae2f28cd8827aa3f710b026cd1a7a/91789117798.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wetutudemezezafagov.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/nedajekive.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/71157604906.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/5790124254.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/rorebinezepifogebifu.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/pemereligodepetazukimagi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jutarijenokafus.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/fuvemexosawamip.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/wifimisesarezesibofapid.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/jelixiwiwazil.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/pozeper.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/46489488248.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170747d4f9---jeboduza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=temple+run+holi+gamePDF 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_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 19644 bytes
SHA-256: 330c8f08d097e73696cf1690690f27cd96542e2c16d4b8d0948aef99cd6bb1e5
font_01_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 10496 bytes
SHA-256: 9129db1d978fca286abd31f39ab19e34872f94c32b6e37da4696cc4c810ac872
font_02_sfnt_off00014519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1