Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fa7c3f35226504…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 01:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e41eb26e510a245d4d4ebb9c4505af6a SHA-1: 83198ecb6358f2feb4896ec95123a8175cc5518e SHA-256: 78fa7c3f352265047c4b915334c759c3b5dd93c1917e9c54f8a26b76ac556093
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The PDF structure and numerous external links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://philabc.ru/uplcv?utm_term=karcher+professional+puzzi+10%2F1+manual PDF link annotation
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bf4d6f59---valusivoxoxewubed.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/juxilez.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3319b44d048eb54961c681593fd4ba18/lixar.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/57976620459.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/9490458199.pdfIn PDF document text
    • http://planetamama.ru/files/file/novodutiz.pdfIn PDF document text
    • http://liyangah.com/Upload/file/saruxofikakomusoxe.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/nadoxe.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/laxifazavameju.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/74047857135.pdfIn PDF document text
    • http://ledins.lv/cms/file/xerabuguxi.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/moxapivutikapuzomukaxuju.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/bigokakinukubodefezedifez.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/19655457518.pdfIn PDF document text
    • http://allycatering.com/userfiles/wuregewenudilobigo.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/43111765529.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a9873974c22---22222976792.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/2237625559.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/93651916735.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/17880434864.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078406928a1d---xibamiwolidufigaguxu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zebof.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6bc7f19e273edebed32e1765e6cf0c17/3295013149.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/fasokisunejol.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/51304378222.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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 17620 bytes
SHA-256: 80019017004a5f2f4e5beca19e376cd1002651ba8baeb35f3fcd59046193de3c
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 11004 bytes
SHA-256: 1f3a5638551055e45512ff9314ca2325eb300a70e06cb86ee48057f864cdd9ee
font_02_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1