Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e3d501a322562c…

MALICIOUS

PDF

81.5 KB Created: 2021-06-26 01:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 274de40df620be9757d8c1152038afb4 SHA-1: f5ee5d29f79930f386d80b0935c9da6ba7f5f160 SHA-256: 43e3d501a322562cdea8b9b582cdf3eb1c5fee0e270266984516d7ad950c28eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file 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 WordPress sites, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1c2e189a---dojejapojekewama.pdf
    • https://chp-travel.ir/data/file/53468538914.pdf
    • http://absolutelyneon.com/userfiles/file/wovugopuwifob.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pibmltf9jug0vqpadmotba8di5/kodovojulozigonoxuw.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfd85504c4---gezek.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/hbc020e99onmsogen0703o2anu/pifubixakiripo.pdf
    • http://thedewakohchang.com/image/upload/File/6566321800.pdf
    • http://alpha-cp.com/userfiles/file/48956122837.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc97e33519f---muruxijesapugo.pdf
    • https://finatwork.com/userfiles/file/51978644698.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517135237770464.pdf
    • http://jp-cable.com/d/files/17298259078.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/670c3842e3b5af2da0939b400bbbfa91/75350727950.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6f982e0f8---35311361555.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/716718b9b5e3612f29e7495e02abae89/velufikun.pdf
    • http://rungrawin-itt.com/userfiles/files/30165666574.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088423e666fa---gifamenitiva.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e6ec05bd0d019234c6a6628bb4a1baec/zawasupeganorilo.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608521453975f---46976739049.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/credt3f9skrbng35cck93jihl1/53607645915.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f7663853---rewanobidulajeralukolovor.pdf
    • http://flygarfield.net/userfiles/file/bisadupuzenajojupozafu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/79ee46f21c1d703730beb4fcbac132df/soxujevolutowinutotoj.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/543da82e9438338a45d9c3b932e4417b/61643930758.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d525ad9879---piluvededuxameve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+contacts+out+with+acrylics
    • 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_off0000dbc0.bin
64906ada90595e761894312eaeabdf3ad66cc1f758742476dbf8cd4e5f56fe33
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 16848 bytes
font_01_sfnt_off000107b3.bin
601a980c571f55abf04a3263d9b47ed2c7e21c42eaa3a1114c92816aebb58eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 10800 bytes
font_02_sfnt_off0001209b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 16792 bytes