Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4308f55048b219c…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 00:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5839192e1dca38d2f8d2b362dafe4762 SHA-1: 2a3ca2d3ac3ceb96260cad9a2bab2747f71dfee3 SHA-256: b4308f55048b219c902d82d2c5454e319b0aeb7eab8ac07965e992221211f7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories. This suggests an attempt to distribute malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4511b646---bopuwazavevero.pdf In PDF document text
    • http://devison-matras.com/upload/file/4896649521.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ue2mp2sttq4ggd6l27j6t5rp9j/nofulapiravijulekoloruru.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/muzosenarese.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b76995c6d7b---fazet.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/05toek9635n4gmc3igsoot5clq/56304756911.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d971ffca1ea7e8abd3c7957f4887f371/pomobav.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb2531fd9---mimikegevizunot.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070064704115---gewadipefuganopup.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fbf655b988feaf8bceccbb3ba470241c/79606119539.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/70468166502.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812bf08ca97---23844176972.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c749768a812---fofizo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5cc0b300d---29847013108.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/43986106c7709c6e5fe6fd18ac2c5046/mifinobudibeluzaxejubik.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c710ecc9e1f---rodunenenotigamixelinagun.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fonivemitubonojapale.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/xojulukimezafenerorawanax.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/poliwutip.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/99948685602.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/69746652938.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/paziwax.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d2116ce5d---84439368010.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/592p33lffttr48kd8huhvtuld0/gewadisenenisufewanin.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nnm7v3llcju79l4t3hsncnmjfh/80292294002.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56e27a89---3891957464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=two+dimensional+fourier+transformPDF 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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16608 bytes
SHA-256: fa4f15aa477c3524c57c1bf2261aa4e22ab0a48e866b45e9a445c10e57b26120
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 10664 bytes
SHA-256: 11e0557b05290ca4ac43420fd3665054de1b6d4e819dcca633f4e7d3fad57fec