Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9f442880474c90…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 07:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33c578e17bc26d70837fdce135492f85 SHA-1: 9b443ed0be95022ae45cf40723d168fbfc53067f SHA-256: fe9f442880474c907116d98773f402dc0bf12c1acacb7b60e0077bc49368891d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and IP addresses, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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 https://larrialdiak.es/files/galeria/files/11427098686.pdf In PDF document text
    • http://aligokdemir.com/resimler/files/85257587135.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906182253842.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/8417789209.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15cd715ac---linejukinugexuwo.pdfPDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a486530e---62217999671.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/jozobojibedavuna.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/35101265537.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vilirot.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/53784876160.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b18768d600ba89937f4a0993bced4e2f/28466037337.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/25095649289.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ucippbdrm0ouc46hehabdsjs6/pusulipi.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/bujupilijelemuwuxebig.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/13610260956.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/8451748017.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xupozuregabopi.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/72414411215.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/67345764458.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613395070ef76---87538450193.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210909033510.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/81040013534.pdfIn PDF document text
    • http://schubert-hh.de/image/file/24811012854.pdfIn PDF document text
    • http://moneymaker-gold.de/files/21538936152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stuck+on+restore+screen+iphonePDF 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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 17180 bytes
SHA-256: 5d4b7d63e11a1a7958fd131bd41a30b0cb3c5c99194d71e5490b8786d7d7f029
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 10528 bytes
SHA-256: 41083ab3bb79ffb642fa29cfa96e36cf9923357835f786ff60033be4f5f1fbb1
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1