Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea0a6d8d0f9b0f6…

MALICIOUS

PDF

88.2 KB Created: 2021-07-19 00:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dac52b12bd47cd3c3b9c1a1307e22770 SHA-1: 3ed88a373c0d200ee41003a1c7d1e349fda6e6f1 SHA-256: bea0a6d8d0f9b0f6ece6331640412c51eeb85acc744ee599bcca9927ae2963ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to a compromised WordPress upload directory, suggesting an attempt to host malicious content or redirect users. The presence of numerous external URIs, many leading to unknown destinations, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c219098adb1---24911768259.pdf
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/salizomunosopif.pdf
    • http://akinmedical.com/uploads/file/95333371886.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/minezovunotexekipekezev.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/497b2b74ad846ca43dac59608cd7a7da/89526973530.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088294858b17---lorodazutofoluviwe.pdf
    • https://liniagdanskzydowo.pl/files/wavumovivatu.pdf
    • http://xlsferrosilicon.com/d/files/votibadufobudej.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7ves3drqjgadfiajds8lcqqhar/76640148160.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c8795c1---lavejemumubezexin.pdf
    • https://bayihoki99.com/contents//files/dujaxepajikotar.pdf
    • http://fertilityupdates.com/userfiles/files/52093029608.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608389bf24c58---jenumibifojuvofomitavuber.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/77c12192c817030a29ede42a74e35508/39730108222.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/57651e6c931b682b4c184ade7c296531/17240559895.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e349dcc29c---zilituwi.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/568759dbb0ab2068467708a7e4090742/99366370771.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bdd89496---bunaxebonudolaw.pdf
    • http://russia-ex.com/fedipexuvemadexexorisa.pdf
    • http://iburgisidimarsala.eu/userfiles/files/lavuremalapovezupifol.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091093933dd6---nusarapabekifisoz.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/cb04306b18a8b299fd9173e3740f07b3/sorolikikoxudawesuduzedow.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca146a103c2---19578234367.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=slow+cooker+roast+recipes
    • 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_off0000f7af.bin
beaa50e8ca9e0f4d07da2193af5b7ae40840e119e74322df33c3532b0a26b9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 17004 bytes
font_01_sfnt_off000123bf.bin
3e5368444c6d7429d3923283b2610625897d60d77bd681abd68c73a7084731b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 10516 bytes
font_02_sfnt_off00013be3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 16792 bytes