Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5717848e31d0278…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 04:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0a7e864867a68cf1c5a862d7eab034 SHA-1: aa22dc53cde7e2c5364f8ab8c4af133ba8628c9d SHA-256: c5717848e31d0278773e78bb5ad514980d0d784eb673585f351cd72e933f23db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161266864d24a3---219698144.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9bd21af3---88367062261.pdf
    • http://funperm.ru/content/file/rakomo.pdf
    • https://aronabritcan.com/userfiles/file/vujululemovobi.pdf
    • http://www.ez4parcel.net/upfile/files/2021/08/20/monupasajotusorexofagidet.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8ca0df47240f115c443ca1f441ebbdf0/semoxudibik.pdf
    • http://riskhedgetech.com/uploaded/file/142067135360ae5fc869f5b.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107ffc72ad91---segujemopafawoderi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbf1572df6---12342905009.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3e8451c32316e5c7688a7d808a5b3763/nojakusojugaleposog.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc27f079cb---4426072610.pdf
    • https://fertilizergranulatorprice.com/d/files/9197579749.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ujl0q76qlepecftirulvkrh2f3/53876650759.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b594b224666d2dc8c6272331a251ea5/wovelini.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hnei95nqrh325kjdao5h7t0gus/41786836968.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13dfd8095---20621738788.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/42357747529.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/770b8c71e2e5d7d09abe38712e3a740b/53747040113.pdf
    • http://vrieshorst.nl/images/uploads/file/numibidugitezajalolekox.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16088604ebbe65---zirogolugujadufisorex.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210611_D1585ED2ABE98161.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba9cef408---remujenapikopodoxugipiwer.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803eb151d31---tazatoworepewivor.pdf
    • http://elementsgogreen.com/userfiles/file/gumonoretakej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=deodorization+of+edible+oil+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79c.bin
afd0751e1a7db98ef335e287bd71399e7f7a39560cc9fa72155555bb218dd8de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 17700 bytes
font_01_sfnt_off000105b8.bin
b58dfd149bb32798accc05e001972cdaf9a0834bc8ee584f386596aeb2b1d3dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 17692 bytes
font_02_sfnt_off00012090.bin
e7e5b6933534c4ae5fa6b962cee9078abb13e3eb4235c85d2328515c07adb357
pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10524 bytes
font_03_sfnt_off00013864.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 16792 bytes