Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee91d916313edf60…

MALICIOUS

PDF

88.0 KB Created: 2021-10-12 15:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1101513469925dc636eb0b62b6d59096 SHA-1: 4091d1870a9158005b792f4e83da60b463599866 SHA-256: ee91d916313edf603efd3d6071257b5cc2879a3143e2cff0d09e7c6cb9bc01b6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=guided+meditation+for+self+love PDF link annotation
    • https://minjar.mebel18.com/uploads/files/xijekifidanon.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/pefadaperud.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/74035712065.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hiqq669s9qn0cd10h3pku49pap/6579942104.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109050913434221.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210922232944.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/fikiwutinonedodovuwopi.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/rarudugegexa.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/gomafulifopovosufuka.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/59160975201.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/xijomidasoli.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gezubakuwonoxenodib.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210910131534.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/97429878528.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/45600045446.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/tunuxiwelokewamepegijopuk.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a45c9d74afb99670f8049a6f357a3332/volaxukafebijimofat.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/1098760826.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20211001111012.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/69199070868.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16157fbc83ef1b---96196044553.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/jedenufuzuxivumodiwij.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/64307216703.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_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 19100 bytes
SHA-256: 03e5066de3781ad462398ca7f2036c4c6033aab87b09a142316d0247618debcd
font_01_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 10720 bytes
SHA-256: cb8cc2175496dd3c3cb88a9f0dddf2ad16da7e122935290920d84e4d5dd0a507
font_02_sfnt_off00013a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1