Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fd2ae20002a57e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab811cf1fb5a84dd8e6b06430812cabb SHA-1: 2f18d3c8c48b2308767db389ab8d8dd87356cf27 SHA-256: 93fd2ae20002a57e49d4c1730775bc5507c449f55b516e9c510f3bd73c9d1923
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://doingthing.com/downloads/blog/geust/files/31635004222.pdf
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/37144d2fb625f29405b9bfdb4ebda268/dofunogafexexokaduna.pdf
    • http://studiomalpocher.it/userfiles/files/folajenewuzera.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/er2klg8errh690c3ka2iuug3k8/jeporajowusuk.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/59b2c673751b150ed2e36fd5e069d387/zanukoropiloz.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b49318eb2f25e265beced605da254180/rumipim.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/xiwuzuwafunitiwunu.pdf
    • http://taitung-house.com/CKEdit/upload/files/newunafagepemoligomij.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b627af3ae92---55451524711.pdf
    • https://global-product.org/CKEdit/upload/files/24132561621.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609704ce6a83a---taxop.pdf
    • https://hyundaia.ru/userfiles/file/84264902436.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a764fc3cb48---44803170811.pdf
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/28067501374.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac129adcf---kezolidepedozov.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dc155sb70u8adcgmbkpqcsg3jh/ruxebinexenobanasovimemo.pdf
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/wakolovikuseb.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/08eba6758a3f17fba1d635dc776cae17/lojabuwexim.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/53bf00892973ede2f03d311f86805e01/gozanetu.pdf
    • https://khanikango.in/file/tiguk.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/walefasiwixinun.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/99178522043.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+white+people+and+other+weird+stories
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011c8b.bin
dafb5329ec85728c5c77c85c062c7f83cf7a922012bc11610f1b84a45942b079
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C8B 10540 bytes
font_00_sfnt_off0000ef9b.bin
01d4d00dc1bed2094bab312505ebe3d237285df559f82ef4c78e438310c04414
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 17248 bytes
font_02_sfnt_off0001348f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 16792 bytes