Malicious PDF — malware analysis report

Static analysis result for SHA-256 43faa99eb2e60806…

MALICIOUS

PDF

92.1 KB Created: 2021-07-18 22:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ccbb6096ef1ecaa80ac341145136b96 SHA-1: 3bc12de30d26a5c69c08044f97e0f2d9e8cd6565 SHA-256: 43faa99eb2e60806513bbd10c26fc463481f322536b42945079fe95da032b574
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://debeleven.net/UserFiles/File/xaronazopimepefekutov.pdf In PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0b9mtv0go2c4em6ba0nja2p62q/50700060204.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/29273782679.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/519009962.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e356c9da055---36614800544.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/83d78f9f78dc08fe848ae08746dad88f/60407816492.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/bozulozakodizuxita.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3000e9312f87b36a424b65dd52eb47a1/rimaxaximipolifiloz.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/75517582452.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/83516197845.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/28947144841.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kelijakiludiwilalanepe.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3d9304c00aded13fe6e2edc4001cf0fd/zenirumetovuxexojegike.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/10413216675.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jirus.pdfIn PDF document text
    • http://flexa.cz/docs/file/33870522173.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bb3d1cc1---96693237338.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/gifikopodime.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8b1623de---gavuranubasitifep.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/95837829833.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k2sphka8sprruio9g2hpmal4pm/nigudenazi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b62d5eb65---68340419173.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1b3e21e0---49423352567.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a026cf3061---xujeres.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b4fcfb27e33cad29bc697549a1798509/68024577405.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ce9b609f---xozitogewiguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=professional+bicycle+fitting+near+mePDF 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_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 17212 bytes
SHA-256: fe224a9a0c26ef74bee013de1a8938a365b17187ce8721e0deda47c13798b7da
font_01_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 10936 bytes
SHA-256: 37d8ca5f2954a1d2120ff8a2f8098dcef35fdcccb2d8bd81c5d61b0ecec15ddf
font_02_sfnt_off00014b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1