Malicious PDF — malware analysis report

Static analysis result for SHA-256 12704cc0e599bdd8…

MALICIOUS

PDF

84.4 KB Created: 2021-08-20 02:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9319f9ad40e949e2fdc9d6093d478555 SHA-1: 1b32bc5e054fcc9e064cfa35cf1329d655075186 SHA-256: 12704cc0e599bdd8556b6b2fb71fcc8d33c729a90f76e05c713137db4ad266ee
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URIs and a link farm structure strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d281a21542---busejowur.pdf In PDF document text
    • https://lapalettedesarts.fr/gestion/file/81685707186.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091211908e96---4497280390.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e929ddcce2---24000350830.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/rarepagiwobapeg.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/tokopozetagaka.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/10827789159.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/tigamajetarafizo.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/15801899149.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/08f2293b03a00ec621e034950c115d6e/safesagulupefaro.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/94682960986.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/39928960534.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dd17b7b1---taxeruwojurubedinemitaj.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/35638690274.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/vokaf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cea202a75---jaxomijoluvigexopu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4872ab86731849380864b65c423d3047/depowabijemevoweserevulig.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ciavnf6j306810qthakmgmpaq7/rufepatezumifikowagatu.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fegavikikumeraguxigekena.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/xowus.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afbef736e4a---wubaropitolugiwolidoki.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d7381df4ab13b7be53c83fcc6287b3b9/54858279766.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/93468738237.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/80927631857.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/tovubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gta+vice+city+cheats+apk+house+downloadPDF 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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 16692 bytes
SHA-256: 4c7ae70e656c1828dff91804eb2c6ff61040f0ece56d8a2f4895df1d4bb04378
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 11008 bytes
SHA-256: 5955b9614355f6dbf6c569de35eb2796ef9b2dee43ff7456a501ddc175a195df