Malicious PDF — malware analysis report

Static analysis result for SHA-256 71acd3f0cb9c0e90…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 02:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50f02b527fb9ba0c2e3e4c0c2d442f55 SHA-1: f29a221230d9de394fbb79655318515dcd71d832 SHA-256: 71acd3f0cb9c0e90aafc06bd899e01b9213e0e3181623a596e09cdaafa7fe37a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links strongly suggest it's used as a lure, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://iqlacpro.vn/emotive/upload/files/pikulejovunukokiperatubeb.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bf6da7ab419053fbf7de5670c7317ddf/zebadapoxewirusogak.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f9e7299319f289142c228ab419734110/vuterakorip.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c46fe3b6772---jajofinigodapinalago.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f514841ff01---zirejilel.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/goginubisabifojilib.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160954593685be---logoko.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210623091506.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046a66a78d---bakisenadejuxalumo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af94bd1826---80301297660.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f0011f4c---34538061446.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/88393974403.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5dec2ed4---11230843524.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/93630670784.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eknspd9cj2ql77u7ou7bu4mnn1/85499828367.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/184ebf38cd3d1a390e51f3e115009901/66435432621.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/13099523233.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/de456d0a548d680ac3d92537cd0dc21e/banogubed.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/64593506056.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/rotenafazewo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/2pj4sr9teaevv5nm91dno95oil/95093079043.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/pexosakoredifoxevabewox.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zugivozojalusojavadowez.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/50440613994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=aquarian+tarot+book+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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10604 bytes
SHA-256: d8d5a8dbac9fb280a0320df707ebb91f246b0b2cb32e1161599e5542f279a090
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 17568 bytes
SHA-256: 7f472c5e1c176281f943bc2505abe4f75a052b8ba445801d48cb5f0d3105010b

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