Malicious PDF — malware analysis report

Static analysis result for SHA-256 be991501a47940a0…

MALICIOUS

PDF

75.8 KB Created: 2021-08-17 00:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3e51ec912a75d2da28ba0516dc294af SHA-1: f010863fdbce4f282ec46e0ae599e329e2d5378e SHA-256: be991501a47940a0f93d2414a11b64c440d70c7bbaacc9f953aa8d78605cc2ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajusososunaloko.pdf In PDF document text
    • http://s-privod.ru/userfiles/file/xevetidegaxa.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/24376326307.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2050337b1---95990381433.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/labudiralosinexawoze.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/70salogae4fjhfkckrhcflusb4/tewobilukagovovopato.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb9f92a5f---61641545707.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/51bc04fff6eadb8525b5578ff8920ea8/59272606774.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/bilasojuvaxike.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/govonujujoge.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/56868016336.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/muxakozo.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/xepisaromaxitusamaxitoxe.pdfIn PDF document text
    • http://vlajamo.cz/images/file/kefikujawimedubipawadep.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c66fe39414c---bejofiridore.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/98905309015.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/7689402582.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/35319041377.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/kuvimumefuse.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/29590654835.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7f93b4b3f46a1e720589578f2645c143/21021559829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=learn+how+to+fly+2+unblocked+hackedPDF 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_off0000c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B2 10924 bytes
SHA-256: c4449eaca1339ff4c6f1314d06dfa17b99e2c5f113e0acab76747c6f2724dfec
font_01_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16692 bytes
SHA-256: f9d6c0c208d3991f3ea4216424ae342f1afb5160452327e99cd9fca0807f24c9

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