Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f2ff5cdec8e4f9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 14:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 113ff3dba15fa14eb9c99d18056a7426 SHA-1: ed67a3d37f958d17c42fff62053a2cbb844617b9 SHA-256: 41f2ff5cdec8e4f9967563d9da5a0287fd2029f7fc7bde81decc94fe5c9bf8a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with multiple URLs pointing to potentially compromised WordPress sites or disposable hosting, designed to redirect users. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=period+calendar+apk PDF link annotation
    • http://zhfangyuan.com/uploadfiles/files/50415544353.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/88482156828.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63f19e2f1cdad67cbbaec8d8d5b61be0/38660348323.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/sukewigajanuvupawaluwis.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/97981987613.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/pizesuwewigejusawili.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210903_8BECFEC8B9E22163.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j0e3p8o6vcp1d68orlksuu1ts6/guxodemupavozidedoda.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/konetiravavodog.pdfIn PDF document text
    • http://xsteelstock.com/d/files/84803740514.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7dceb7461---zakogi.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/gulokonisu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16141762f657ef---12385825375.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/segefonazovetuzozalixaxi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/56926509336.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/zujadiba.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/20883241404.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a192879035---71452791503.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/42741043040.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/mukumefuwosi.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/48335442485.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/nilotedive.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/47323856597.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/lipujumoxobifibup.pdfIn PDF document text
    • 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_off0000b629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 15528 bytes
SHA-256: 793144f4b0172b971525174c52c97d77fa03badbf4dd4f8aef49fd6a73a2d7e7
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10336 bytes
SHA-256: 1c1c251787e1e37beb5302a293581a80b98d3542ce2e70545057004beba7af48
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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