Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcac983859f717c8…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ddadcc45d28317344a869e0e1b7fe36 SHA-1: 7d61a00071dd6970b54465beac473c5d5d8da5f5 SHA-256: fcac983859f717c81962ac019899fa290fa4470d77ed349b327f9a369dda78af
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb563745e3---84613888014.pdf
    • http://synerfreight.com/syner_upload/images/files/254463247.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da14660c6f---rupuvomuwegelizatesofovi.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/te2o0lctjia72c6kje51qu6oeq/20428658454.pdf
    • http://kanstm.com/ckupload/files/rolubajiwawako.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/42f40aea32b7982bbc7f5fcdacd48f9f/35215630324.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078de0c86ed4---7670875078.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098989646da7---41596922584.pdf
    • http://barcelonasixtytwo.com/userfiles/file/zuziru.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210624_CD9872959C6CDF5C.pdf
    • http://dioceseofniranam.org/userfiles/file/mudiwetotoperunonuzetejon.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/najifetot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd474c464eb---tigozulazov.pdf
    • https://vildmarksjagt.dk/userfiles/file/35475601551.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nd145b00in10t9upk1d14spnuf/79104080881.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0eb23c8d9f28f2540795dc2081772385/53933515669.pdf
    • https://dpengineers.info/admin/userfiles/file/nabepoj.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780c7a8e2b4---31645155355.pdf
    • https://tecnibat.net/uploads/archivos/88508795348.pdf
    • http://igruppe.no/ckfinder/userfiles//files/10322852973.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/471876a511dc3e29ae236744cde01981/loluvagiliforuwifopogixok.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f875b7ad03---vifupini.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d8dc927a8b6ad2c1eaac0b992bd54ab3/gowoxofiwexuwokudaxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=national+reconciliation+week
    • 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_off0000f414.bin
71df2226bebb21ef442c8b81d860570db689bee2564b326b38235d173586d2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10212 bytes
font_01_sfnt_off00010b24.bin
30eb9cb2db33e0ae2fe8ea65061486947568aaed8401bf5776885b82e89fa092
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 16988 bytes
font_02_sfnt_off00013743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 16792 bytes