Malicious PDF — malware analysis report

Static analysis result for SHA-256 22419d300ba75631…

MALICIOUS

PDF

104.9 KB Created: 2021-08-18 10:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 938daaba2a8ee0e544411927b29383d5 SHA-1: fd59a28a96729f328afa710004512afb88733445 SHA-256: 22419d300ba75631f0ae5f2868033924af869a794e3b43d1dcbf894ae0ca67ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF containing links to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs, even if some are benign, supports the attack pattern of luring users to external resources. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1e608d334c60942909bba160528c3551/fokakobuduluravutororebop.pdf In PDF document text
    • http://hzbmsj.net/images/upload/File/lonefivixutitasalezupotuk.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/61980209443.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b16ae0e431e22765e14a4ae104a37346/gaberadekalomenagolopuj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23008958571.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/lexital.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/xedovulaluredobepeli.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/kidulofesekeride.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gubajadulafodinujemajaza.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/zumiwi.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/38455674253.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/723243829.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/47421269681.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vewewijisifega.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf231a367d---52289315175.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4913afdf4a86bb124ed5798eb5a25cf6/433514182.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f416b91c---11512369301.pdfPDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec055b4e9---bidilivilimotadafixewuvaw.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/medadekulonafutoko.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/genunutege.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-1/20210701033609266618.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/86243637597.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/wakavoxiwosunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chopin+nocturne+no+20+in+c+sharp+minor+sheet+music+pdfPDF link annotation
    • 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_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 21124 bytes
SHA-256: 409d535b8d111907bc1cc871039dcd851b3d5166bf0712afdde92b1d27d04f7b
font_02_sfnt_off0001797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797A 11212 bytes
SHA-256: 3e0cd451451fbbe1267b91b0c6d44f1e46a31eb44465e6f5ff9dc7578882ddb7