Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32ea578d6545871…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 23:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cde1c233d629b86e01c4525531759560 SHA-1: 75945de24c15f90b78de318b39f384fea39227ba SHA-256: a32ea578d6545871b83cc0f20573bc4b761fb34fc5f31cbdf1a596feb2226a75
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8dff3e9768---sirafuzodakulipafu.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/35m2nkqagshhbg2n2mlm0ks0su/16638996773.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/diwitazojamup.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a296fd4762---50348876837.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/47456565858.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/gevozuwe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b347ddf05ac802a78764d4f1047c0507/zagedexalemomaloxujemu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eacb47279---zaviwijadakijaxowovemo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3c949ca8f7b5835ec477ea9cf1e14a31/29041640111.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2e0ae871abefa91b189ea0781978636c/81466367028.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kuvapudebiguwegokitawoti.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/rudizoxax.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zunexojojaj.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2415e296d4---3592149034.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nisowawajix.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kisedofisoj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3a4ed9bc---femujubebumox.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/32542a76b7861488850ea2aac49eaf6f/vigenosovovegefipija.pdfIn PDF document text
    • http://dnepropress.net/files/file/giwavusixegufad.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/kadekirakirajaxeba.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160808971dbeec---bivavesovelesiwedirobane.pdfIn PDF document text
    • http://aweibel.com/Photo/file/13745905660.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608394be82563---36964639413.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3106dqb1rcvb91vn8pr1ufjn5i/puwowaduwus.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0ffcd519---xosukofexezuxotavebenifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=breathing+through+a+paper+bagPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 17072 bytes
SHA-256: 88eb9b5b50201e57a0b0af271c6e1831a3f77f66aa9483047b094279a6a49b34
font_02_sfnt_off00013ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA7 10608 bytes
SHA-256: a65d1c6ebb90a79d161a60e9f05f92da13c84a2d308a7485a00ccaad3146cc85