Malicious PDF — malware analysis report

Static analysis result for SHA-256 afed08e073ce640c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 07:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80346d2a02a2318eaaf8c68e7dfc4107 SHA-1: 100dec346d6f695f3c4a18bd8cbbe33a87646b32 SHA-256: afed08e073ce640cbc89ba45d69d24d3842453ab410b4675c22d52b283592bac
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=survival+io+games PDF link annotation
    • https://granitnet.hu/editor_up/45701216853.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/58a26c63d2367ede45220a05d2ac70c1/56062194354.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ds23ui80u8iroq29h5o6trt6e5/10149209919.pdfIn PDF document text
    • http://rrarental.org/upload/file/kawuroxinatatitovunaz.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jilujufu.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210907_70D9985301F7667A.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/tadeforitibefid.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/devigagamijal.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/nuvuxejizi.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/ralopinupa.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/89952971789.pdfIn PDF document text
    • https://cardolf.ro/files/nujugi.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/84967923891.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/39278791312.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/34419908554.pdfIn PDF document text
    • http://wajl.net/img/file/20219343025.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/44232138642.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/gaxifebizazujevore.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/xijuxodajitekulerekoge.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/59203325740.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0afae30e---ruvin.pdfIn PDF document text
    • https://sadex.pl/fck/file/99244261324.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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 10492 bytes
SHA-256: a3a47480e44f96b4b197d58be42f8bc16c00f761dabd32d8ac81b9415bf4eb85
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 16444 bytes
SHA-256: dbdcd4cb3ae3d645c3adf3da8f2f8922021af58f140aa31224f8a479ba043258
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1