Malicious PDF — malware analysis report

Static analysis result for SHA-256 4281128bcb9214bb…

MALICIOUS

PDF

109.5 KB Created: 2021-07-15 23:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15057d0047651974c7dbecd3ae132071 SHA-1: 0aed37ed170411ac41e36792505d961eefb8e34a SHA-256: 4281128bcb9214bb6546a7d00046fad15f848a34594054ceeedf3d97d9266db2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://queure.ru/uplcv?utm_term=how+to+see+who+someone+snaps PDF link annotation
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0af0859ef57da3f4978d0dbe344d488b/77061789776.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/81753094212.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rolapisuxuborefenazopa.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5ebd3657---wigenerakokotadu.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/lesawe.pdfIn PDF document text
    • http://etnorom.hu/pictures/68757397361.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7de38a8035d31e4cb803bc8d25421093/32730733049.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/papufonudemurudototomur.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90383344144.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/50839377630.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/88730268648.pdfIn PDF document text
    • http://tms-operation.com/upload/files/kusavabosog.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/womej.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/sodofomilolavubiw.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b2becd0e---60711519958.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01c0487d1---fakajedanu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e39377964916bd6bb846bb7dff3eb991/87841947506.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sapabusogosirugepukolu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5q6klpbbter16l0s8nmtea0lsa/wetefoz.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/65420bb2853cb79468f88c2b82e999df/fonadufoguso.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j38gilvrr2vcim6sp4hbg96qeh/30871834165.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/79274725885.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/nenitotuzopifetinidunodi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b3d0384c---gufarolusenudagiwaga.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e850805cdb---buwuwetikifukazowi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955644fefd---12564034518.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_off00014a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A16 10356 bytes
SHA-256: afb3a1fbc3f6d390f032fca6b1f9a3d7d03e4a4a8357bb1287d71bc5a176d372
font_01_sfnt_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001796b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796B 18128 bytes
SHA-256: 236a34087ad8362acf0d793a1003dc6ac936cdd3bfc4fa86c450049ce958232f

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