Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d802e7c1187905f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 16:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e45653191e503ed51bac12cbbc85abe6 SHA-1: c446d7b6ff251244863304213657441609e27bb6 SHA-256: 3d802e7c1187905fc50e6953b7f6aae60dddc87987bf21cdf15cb675e045d4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9454127668---merewopuxivujuzilenev.pdf In PDF document text
    • http://aggengr.com/uploads/CMS/file/28082611133.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/90308564907.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b22972476---gajobitakifusavegodip.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65dc5f04d25386b541f02df536547f75/74006437382.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/1291389713.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ce18fcdec8464e68fb4007f4e686b239/numotufelafesinexa.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/guwatizafabejo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/565539ec61741c42df1254d2a8ce0cac/dofegefinuxedajenow.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/58615420580.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210706214949.pdfIn PDF document text
    • https://media-get.com/userfiles/files/30662348739.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/xinadugiwukidu.pdfIn PDF document text
    • http://placc.info/up_image/nidakimitede.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/29b10d4455ade1e09c9b6a18c2a5282d/39875323752.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/razikudejogotakunifinisi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27765965b9---27479204742.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/mixuxigilinuniximex.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/benomeku.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/jitutexoduromozo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/juwokawabatez.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608653a9107bc---13839792967.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/bu9ljicvf09psjlrll03i3r0o4/ximaso.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/aeq5t4cvrcq06nmkm5k4h1g194/51977778147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=como+fazer+drenagem+linf%C3%A1tica+manual+em+mim+mesmaPDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 11192 bytes
SHA-256: 46467b00863a9e8b71b340ba8caa563128478e3dbb598aa915553cd041199e6d
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 20052 bytes
SHA-256: 0a38aad810a55ecc887643f0fb182c877724400b84bd4642a331c8299a8a0786