Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9e8944e919076c…

MALICIOUS

PDF

81.8 KB Created: 2021-10-17 22:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fbb37c114815849e56aa2ebe113d6a2 SHA-1: 94a220ffcfd030bea12ab02ec31d1b1e2db17903 SHA-256: 1b9e8944e919076c21f51122c24e5a6eb46c14839367875b87b1e62b59a971a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous domains, several of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://xn--2osv9pt2jfpt.com/uploadfiles/files/xuwumikukokire.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7r4pi50h8jp9iilkpbjd9ssh1p/lumakani.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/zuvovaruxovosijasu.pdfIn PDF document text
    • http://newworldss.com/uploads/file/savasizamedivoxoxet.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rozatimuwaxigutipixovumet.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/45127335011.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/85446650080.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/21477738219.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/47150862542.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/11253644535.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/migidapufax.pdfIn PDF document text
    • http://medi-sen.com/files/files/44027718592.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/41587728163.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/lixuxupatezumos.pdfIn PDF document text
    • http://rcpolypacks.com/uploads/mamadatipivapowigi.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/75819694602.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pibamuzepalagodititerede.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167bce0d4652---55347909356.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/94913000716.pdfIn PDF document text
    • http://marketingnews.fr/images/file/solikewabudada.pdfIn PDF document text
    • https://abss.pt/userfiles/file/jisanavonobod.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/23365721973.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/sarozutezavapera.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/28480988819.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/21628521964.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d36655e1cb904d708e339e30c615f843/zakatokawijodaguzomovibaj.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/89010096746.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/87173538652.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=oxidation+state+of+oxygen+in+waterPDF 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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 17724 bytes
SHA-256: c46e9348eb7f7365ac05dd51412948fb6597395d18e3f4e51da3367a6dc653fa
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 10808 bytes
SHA-256: 3d2a8cbf8c5b39a139220d2826348df0000dbeb5d24dd67fd53dabfa9494715b
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1