Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74aefbf3c530f33…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 05:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63742577c10852d6f4725fb7d129df68 SHA-1: 9eb0677b1a629744a47952045655a1577aa05283 SHA-256: d74aefbf3c530f333bfa7d9798b4c571270ebdda43460491f1b03cc968561cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable domains. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca738cc5f66---44904148995.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/tatukovefolo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225705c20b---2849348533.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3835c4dbe0---91537294703.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/75da6d630366016bbb491dc0d55bf8c5/magebasewumurajikeduziza.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/sibulinanetekumomu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/76805913427.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c946172836---rudiledoguxa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xetaguduvidabisibuk.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dbec08db3---47927489011.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/bonatilixuja.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ba2ab02a---xuxebeki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6660b3c1---masemikesuzalaribivur.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/j5g0fbn3ev8vvbhjmjkl1vo81c/50195135247.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/437e910197f7c915c4686b3e7bb267b3/gavasaxifemotokotebun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a29476874f9---naguleviterew.pdfIn PDF document text
    • https://rcot.org/userfiles/file/41992300032.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4421c604533c5145597aee885f43f63/foselesasajufufaxupulofi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0873dfe013ea10e1a34cb558bd4b8c53/15461705392.pdfIn PDF document text
    • https://plasy.com/uploads/file/nowusapas.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e3d8418c---nimusoxaxoju.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/guwapugo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d85c82f134cf7b0b6cd09b79aa29a367/zaxarolisamuladanozuwubiz.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/180446304648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=polynomials+class+8+extra+questions+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 18460 bytes
SHA-256: f356cea65592b7c3f7942de36a73c7da80fb4510ac099f674ea71e187625f1b9
font_01_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 11252 bytes
SHA-256: a2cc5e0fe7998335b87f21490c1d8c53c1500158d4e3882fd72f22704600845a
font_02_sfnt_off0001300b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001481c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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