Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43c4fceb877c65c…

MALICIOUS

PDF

100.4 KB Created: 2021-06-28 08:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2e023e86aea82dae2fdf880f5b21023d SHA-1: adac28ca246214a66734912942eb062230032b27 SHA-256: f43c4fceb877c65c1610fadad12514de908fb4a2c7007bb7170b7993021d2459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites utilizing compromised CMS upload functionalities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure suggests the PDF's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://archism.ru/uplcv?utm_term=overwhelming+meaning+english PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cf01f7f3---nuzunuxisitiv.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/065c8f55be76d86863992b2726ba0ff7/15201606326.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c085bf1c6bc---wikosizovufozofopuwu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hkqvig3q68r018jp02g0dtoj32/sanowavudijivabepigi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/af9f8dfddb147b6eeb39fb853c279e44/94368097475.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fad6ad46---57961151121.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rh1uq74dugg9r90khbvisu4qh6/zezimenodupe.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fb66fb53---21808253431.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/045869a5428a0f12687dcb749b90625e/33337993946.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba976ec5cd---babijatudoxel.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d6f1e4ced2a75d848c405b3c3112aa58/13805445654.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f04f3e8a0227e7f0f1488cc5c1b2a12a/97727617889.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a56b05bd26fe2e1f33005857b5583e29/35502190340.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b99f5028ad4---deviginiwusonok.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rimukudigis.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ce1da240---xipisonotenakonobo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36b698707---70032384137.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/12933255725.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/debakeluxuwiwakaka.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0b43f31e---fuwudef.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/juzasezagidorime.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///leridomiv.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c9891848---rupugito.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ec0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC0E 18360 bytes
SHA-256: 0185d2ac674f82d20b14138693fb59c29912ac4c6a1acdff92a79c250ac71cae
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 24340 bytes
SHA-256: 94296cbb125ab14f1bd025bb5d14edd092d471d4b0131874ccc29e02fbb9034c
font_02_sfnt_off00014644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5B 10512 bytes
SHA-256: fd7409266949d175906615a3523cb93a83492b0c26baf2f080ed53fa00f61984
font_04_sfnt_off00017622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17622 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff