Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfc718415d5830e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 10:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e98f302d43deaf93845ea36261210dc SHA-1: a58de9f948322e2ef5387f8f97f6fa816164badc SHA-256: 1cfc718415d5830ec8bec9263487691c04cdc13252437928467029e873d1b78f
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to disposable or compromised hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure and URL patterns strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5982

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=kindle+paper+pdf PDF link annotation
    • http://angelofthewinds.org/ckfinder/userfiles/files/binujubafevo.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dujivosuniwuva.pdfIn PDF document text
    • http://zae.me/datafiles/file/vizenovufeweba.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb87669d6c---7297627891.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/vulawuxug.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/11869495085.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/kamesososalufekidewifeja.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_73B235893ADA7223.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/73149630107.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/98808251905.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/nozijora.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/ruzulofuvuv.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/dusonomovajudo.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/bedapunisorevidolunifubi.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/26761193080.pdfIn PDF document text
    • http://ave-france.com/pics/files/7984362436.pdfIn PDF document text
    • http://huntland.hu/upload/file/30770320242.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/29327707026.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/46848462635.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6145f40bd8cde.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8882ac2c---duvodiwikezav.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/60841418045.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300687d48a8---50114550831.pdfIn 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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 10096 bytes
SHA-256: 205b2590947b2a3e26eb3a00a9319445637c0f7eab94f3a84421a9d142086852
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 17544 bytes
SHA-256: f787509f806c288dd8a56cc1be9856247ac3f5a8d903352a4fff61fa7efd289b