Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7936ca3e115f49c…

MALICIOUS

PDF

122.1 KB Created: 2021-07-04 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22804f586979fb518ae534aa8f10e2a7 SHA-1: 09587d5d7dbdede609e16f3be69cd6ceed873758 SHA-256: b7936ca3e115f49cdf9740fda28f14fc459d98ea9371062ca51a02b8236a577b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the structure and numerous external links suggest it's designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://escqatar.com/uploads/userfiles/file/file/gapalizewasutovodibi.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac8db2f30---donosarogufowafajinu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3109e5f20---mafagotudusewezanegi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097479fc76b0---34422054039.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160826adebfdd1---mojogabelexovokawomuluf.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f08fb1af8---79692311644.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607678d44f16c---61735864297.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080216658ad4---domajusox.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/73481737068.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba895112ad0---lozisawirogupaben.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2910816807---tozivetajogevewu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jezifumuluma.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/zutatovemizigete.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/54557634166.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/pedasesuregis.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92937073492.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b0ef32e2---2258394397.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jknc3rflr52hsuveqp7qks3ajt/83583624182.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tapenumewidisobofenadok.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/168a6b0d169d91cad48cf0cadb48c7fb/38727822677.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607265bbe9bdc---vemomabudowor.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160722c540cead---povugogotumadereke.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/visategud.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/78096489675.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jotaregobomenazivigoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=stealth+black+holesPDF 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_off00015ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000176b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B9 10336 bytes
SHA-256: 8b6624daa0d6a6d7b0bc22d97cfc51dab3df508d9ba290aa689dac0ce7d60e7e
font_02_sfnt_off00018e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E36 20476 bytes
SHA-256: 1fdde8b661d28778478f80cbcc1a645a90d889e0cda337e2edb4fbbc5a99ccd9
font_03_sfnt_off0001c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C543 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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