Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe84538387a168e3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 05:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 201f05e7ff2b5eedcc3879e970927d1e SHA-1: d33d408d2364201350a6e3c935b04505c409efa2 SHA-256: fe84538387a168e35d881db04a795d6edc0f77625e3ea67d765ebd2bac19399f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. These links likely serve to distribute further malicious payloads or lead users to phishing pages, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fb2d41f2d---55833108592.pdf In PDF document text
    • https://mimpishio2.com/contents/files/midiwojudojifixekeneleke.pdfIn PDF document text
    • http://momsystem.ru/public/file/24509313618.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/38005988915.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/29837088135.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e4943e7a---9621077541.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/nojeterugibujigeku.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/r0m05410tjj3ek705unrpnq5ql/31903460174.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/kelemutetetixinasemofi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210612_BF3E7DBB88A19000.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a73c6bae0---neluzex.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083deb3a8864---vetikojifimepivarigat.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160add7a02d0ed---rolakapoviwijul.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7a2b8f28---xorovozunikamulepa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870bfef22aa---sovinegax.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1f3prqf8u5dquc04bnmdj8pab6/savok.pdfIn PDF document text
    • http://puisan.ru/uploads/file/89437007975.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/tifesoru.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/ruvezajarulopumab.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/4829457082.pdfIn PDF document text
    • https://arerp.kr/data/file///somediputeluzewopawelapo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/negakuxudak.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/98551485267.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/19073964252.pdfIn PDF document text
    • http://askort.pl/Upload/file/mobibeguxumavazajuludag.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/84862943384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diary+of+a+wimpy+kid+1-7+pdf+free+downloadPDF 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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 18376 bytes
SHA-256: c25d8540665beb05485907470e561d66bef1a636ed02abda0122d48928fad5d2
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 10824 bytes
SHA-256: 9a6f1322042220434e034d036a3206b8cabef5fe40adb4e68b82354b53ee3e0c

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