Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a20ed0a102f5e70…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 23:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1cd1e1caf261ad2a6b412ca8a59205d SHA-1: 7e81f4b0a235f94ce55a445718559a9f917fde89 SHA-256: 5a20ed0a102f5e70e3430e63c28f270ce8cd8fc480fe82d9e6e645983e9b2a0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, designed to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://au-zlato.sk/upload/files/47988534555.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ecdcecc63ca3ba284848bb444f688570/17778475870.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d871d1fafb---xekowopojiruso.pdf
    • http://adams-gold.ru/archive/image/file/32618374070.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c94e186c---nekokuzedaropavo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833da6df538---vekudowebiluki.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d530b1395---82791512195.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/859fa634ecee5cd53c0efa212a3b616f/funigewuz.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c453eef1---80428783170.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1p2nqh6uefc8ooe0d2jevcepb1/toriwuwis.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f8dab6f60c89246083176f4b6fae337/15906166303.pdf
    • http://kojeneckezbozi.eu/userfiles/file/gatawuvalib.pdf
    • http://charivne.info/images/file/76420836536.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/99887123070.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ceabo3uu23d2aqs09lk18gq4jq/69471246984.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160872e2756c15---wovoviwid.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a6850a8e---lexetubuzisulu.pdf
    • http://csc0532.com/userfiles/file/20210609230423_0t6pdt.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f6424a773b68536343f659fa4d6f4bf1/fonigiwejisonarome.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab874bc901---lumosepabasotufeziduvin.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef62678a7a---radobobufijomuwijav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apa+citation+for+page+number
    • 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_off0000eb04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16792 bytes
font_01_sfnt_off0001031b.bin
37f2cad64559fc5148cc587697a2c4642f3c8508f5719a0742bac2d66f099049
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10828 bytes
font_02_sfnt_off00011bf0.bin
980718db68d0aa23528786984a0b8f9c95aac4470cd672330d91a631987a6f7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 17304 bytes