Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9eccd82a40b03af…

MALICIOUS

PDF

71.7 KB Created: 2021-07-02 09:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b4359f53e0b37f55bb14796e8419245 SHA-1: ef1c086de45b61665ee6b777c5725440e8f00e40 SHA-256: f9eccd82a40b03afa093c887b3efde9207918b864ab703017243fa88c4e12c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://efnnma.org/files/file/terifedagixatez.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9d02f025---delareka.pdf
    • http://www.deewanalarab.com/up_imgs/88074774678.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080118bb3427---dexoboxafosowevikifozuk.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/08da8f0e1defb607368debaa10f58625/47009782181.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a98ca9b2f---39308714905.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607435283b1df---nibufilemito.pdf
    • http://sequirk.ie/userfiles/file/71279756795.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/35a040173d44727b5fea5fa782ca906c/dubusokevebanup.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cir773ba4ejupk561jjn0k8ae4/53722681740.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb251cc263---91728897727.pdf
    • http://www.anclupnapoli.it/userfiles/file/milutumutokanelu.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/fasevolimaserewalin.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1be25d1a65007e160873b90d6e8147e0/rumiwulevakixase.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/96817545403.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5d0a2f23---42120641211.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/nixasafo.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c1248da6---74389553502.pdf
    • http://studiogalata.it/userfiles/files/palawupegedifomiv.pdf
    • http://digitalpolicycouncil.com/imagenes/file/85909638104.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/g5ti6aor4q75g21gpv6gij7c01/risevifudabinironubi.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c557065fd---geluxit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=auto+transformer+is
    • 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_off0000b963.bin
2b2d47223c4dffef66938876f753a229917af88fac571eebac11e1ebbb57a5d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 10412 bytes
font_01_sfnt_off0000d100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 16792 bytes
font_02_sfnt_off0000e912.bin
6b0733488c73fc18f62cbb7a0be3d15e56b46b06aed6213669d4f4d34e7561eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 16000 bytes