Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95059c0985b803f…

MALICIOUS

PDF

97.0 KB Created: 2021-06-25 13:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: 736912e38f5e4a96d0c83a30b5e54b5b SHA-1: 230d6d7b9ba30ce8fa672cac2cecec91784c5241 SHA-256: a95059c0985b803fab544e61bd0292037330b113060c79727067f8eaba4a2e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bfuhinlki8m2p8qkllg4h4d0c6/87884062691.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098919b59303---5598527265.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/86407192710.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/srvb2ukumk2oh6u1i2ospl6pl3/24270739333.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c417fc1c50b4e1f8c11ce0db88f6341c/lilixinoxuxarugop.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/pudakivomalivu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4660736fdf1b416324ad2869dd4dbe96/bimonimufomatapukozuz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1csudcegdrgdfgtg0ea1c9ppj5/4728977450.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3e903e88e3f70448b2dfc96afdb343af/vebitapew.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/10345080721.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215fadfa3---59405449540.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/89153627956.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///vuvovabiwel.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/91493899146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=encore+tricolore+2+grammar+in+action+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 3460 bytes
SHA-256: 956dc9b871a9848be24a174af720fddc87ef84faf82b11feeb6fe4672682d95d
font_01_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 19704 bytes
SHA-256: 28789c5525d869acd607200e93fb87017b807d3954e9969f7ff149ca6ed10547
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 10760 bytes
SHA-256: a08a4263afc47bfdefcad80b1453191251b701ee8044e52edbd3737093e67479
font_03_sfnt_off00015ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1