Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22baad121f21577…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 21:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21aa6e689dbd1415754b67dde542b37a SHA-1: 8939576fe9cb6f1248287972850aaf4814274d7f SHA-256: a22baad121f215779c3555e64d4f2bfe754985482c11809c6923413ef58628cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The ClamAV detection and ML classifier further support this, flagging the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a9c60da78e313317a743ed756788a9ca/16718399925.pdf
    • https://hzautomatisering.nl/userfiles/file/meromorubum.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/74083701773.pdf
    • http://axiomestates.com/userfiles/file/jadowedobujegoj.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cenc6j5bod59r8tdgnifq0ef82/64896772115.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91f624f44---25903613153.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5bt4atjmjjurcco91rgeq3074a/zeredokuruvotiro.pdf
    • http://absolutelyneon.com/userfiles/file/dekiwemosaxejuxikawo.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v8cedf9288vnisq03eu4s314c2/88247842011.pdf
    • https://ludifrance.fr/userfiles/file/sosojapotelidesilugisel.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nk7o48a5j48141auf8qhrdgccv/lofemilumu.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0e6b70358c2c038c27f6307655efac70/84489070955.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qatvdatt21iov1c2rmlvanoc23/14792695352.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607575f10b345---40510522218.pdf
    • http://arcomproltd.com/userfiles/file/5914732797.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/sewegus.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609113c096eae---67073375581.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/lq7kf8he31oiak0ceegeag1rqg/kivofilomuvew.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779734b66b5---33018816507.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/wexupalejukuxinafog.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3e6256e2b6a3ce90f844133e8908f9cf/wigerojowazitodeboruvi.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808fff7e4d7---4163808348.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609102647d5e3---konawufijavejuzorojigetuf.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee87010ab6---56220045778.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/miuhs4ndi2hj1t9kveafc7ggk0/47973289428.pdf
    • http://adance0112.com/upfile/editor/file/6701658780.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wnc+hearing+and+audiology
    • 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
font_00_sfnt_off0000ddf7.bin
8b59a63a3fe00262f6a2b3913046fc8f7046af5ea9967aeabbd22bba9585a445
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16684 bytes
font_01_sfnt_off00010965.bin
fd53ff3b396a25b48f769c897fb7fc4319f465bd5162e4adfa29efb31f439386
pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 10592 bytes
font_02_sfnt_off00012148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes