Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8dfb89340ac096…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 12:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee945c43fa58e4022eb00646432002a8 SHA-1: 6cfbd5b265f201437fcf3b4bd01d3348834463c6 SHA-256: 6e8dfb89340ac096d9f6b8806a9f7ae210def89314dce24f5cbcdec768336f60
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several of these links point to compromised WordPress upload directories or disposable domains, suggesting a malicious intent to distribute further payloads or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=electrical+schematic+standards PDF link annotation
    • http://svx.su/ffile/file/vesidikigo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31effb7c94---ruxalatikefodinaka.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/dotaxibamukogo.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/73833290515.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/29173263986.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160862bb3aa58c---62574437328.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8f9a39f75---42314852102.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb07e4775b---73378023092.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/sawebawivozifos.pdfIn PDF document text
    • http://csp.hu/editor_up/mefofodip.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdef0911897---sexegavadavijezerikutisit.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/acqbc8rqlugdk806t7j1dbf0d8/fokebidig.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/44324300644.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s8evshfvrtnqjn5ca5ced12fc3/suvozonatumaxag.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/kibumuwipuma.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b8glcacu49i74m26ge3g9886j7/1501314683.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/tugobegezabowir.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/jd54g21ivdmd8nvi0ev1025mkq/42194984498.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31a90c5e8---34573197758.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/34ddcea7bbc4c0eb8e3c70de47f83b14/rofej.pdfIn PDF document text
    • https://airshow-bg.com/file/10717547385.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/276b5bb0b0477caa3fba2d3cb505d4d9/lekivinunupafola.pdfIn PDF document text
    • http://aweibel.com/Photo/file/puxamonexatepidarisetogo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21a96b8ba---52991342342.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c83eb32e233d14c95d9f7ce36bbe9711/bunavasemukudo.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/rogalurepuvamomulez.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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10496 bytes
SHA-256: 5fad1809f8fd66ec6c2f406497fb9cc56fd492a4b53b539251be20f4d9aa89f2
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 17552 bytes
SHA-256: ba17784ab12fb559f49b7e544e0257a9f6173c387b167785cf2e3de42e1e3765

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