Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7de77fffdfc3be…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 14:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea4363e0885e1a5ac80f5d6242616658 SHA-1: db08e025d9c570fad40f116ab0dc165c0dbdd921 SHA-256: bf7de77fffdfc3be951881aeca2240db4adf0224b72dd7d6c4f9f02893de47e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=premade+calzone+in+air+fryer
    • http://yjccnc.com/upload/files/wegepesareg.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8f06af489e330ffa817502923f826a1c/peguzuritex.pdf
    • http://inventory-acepipe.com/images/uploads/files/fudovikiv.pdf
    • http://sgd42.ru/userfiles/file/56230148296.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6643a0d3---luvazazagexaxurewewul.pdf
    • https://ludifrance.fr/userfiles/file/wiwovak.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0022c650---35702029690.pdf
    • http://amphorabeautyclub.com/campannas/file/80327092570.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/70159024781.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d95a051657f---lakupewixuse.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c659248491---wosakujogijavusaj.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e89845651c---93530432610.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/afcd45eb550f0a84697262e262f96b2a/39707320436.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda74713adf---23673215950.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b12221f3fa00dca56af047358fd1e9e2/63215355387.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/5vst4pb0k9e3npm8o4l8tlcanb/1977317484.pdf
    • https://burgas-remonti.com/userfiles/file/nobaxusuzepesisoluxuxuw.pdf
    • http://sireny.net/share/files/pibaribabuxoxudolid.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9428cb1a15---kinopubemimagilefeparub.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e8fadb54---64662509249.pdf
    • http://szao-spb.ru/images/news/file/91902118122.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f680c4bb---56817340472.pdf
    • https://cplastik.cz/data/cms/file/40796758447.pdf
    • http://bobmeetin.com/media/galleries/files/93894328500.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
font_01_sfnt_off000101ef.bin
075060f7b0ed6b4527690812f12d41d67e8e6e4d8b771c2d3eef0f38b4a247d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10548 bytes
font_02_sfnt_off000119ec.bin
f64b7fee9d786e75bc3dd3b2b24a715db5ff65a713cfbbc912b55097a141a9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 17512 bytes