Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bf3c8c17d170ef…

MALICIOUS

PDF

266.1 KB Created: 2021-06-28 16:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e2df14ac7d2bef2531935bb4aa976e2b SHA-1: 39ac3fb6afc7a32121993cf9820a5c215c7f40c3 SHA-256: 44bf3c8c17d170ef82ecf218898b07729d41c3513a677ea9db756858b172c07e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an exploit or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/4459902627.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bb6eaafc---zovukofimuvogekegodezogo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/21945776981.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5677d192---43958488592.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/mefatowuwemujolax.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/161157c4017b387bed3b8aed4a7f2675/vunegezozibegeku.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083374fb0c0d---gawegavi.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/64a09e798ce8f0a72665f4a0e9684af7/38440272200.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/jivofetuxaxewotuwon.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31244a9e61394f107c39951744aabb1b/76883537220.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/73432882782.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zovowasutijamitofugut.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f23p8f3qqdmv8e3uf30ijpireu/11416795294.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3fqi1fhm38vrubhv7kqbrmi163/xavonabuxutawasi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f70ee0e20---9420565484.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/45091407618.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dfdsj44v8c71dblri2keqtjp37/26913946620.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1887f700f4---kebegilonim.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bcf87993d4f29750385fe1ea51cd43e8/letigerofokavovapiluvez.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9801bd6db5d5ba3d9a69e0e6fd1ecd5f/kojixenederiwaxisigitigad.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/toraza.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9ece4c6cfdb14e73c6a0d712adaed54a/63742505521.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/457f521cc2a91638208d41ffc4ce6847/bawarebaxebed.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc2852008---2743698844.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d391596d2---wanatalojepakojos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=as+disappointed+as+a+sayingsPDF 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_off0003aa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AA16 26432 bytes
SHA-256: 24491ba077e9ebf95c62df9cedee65bea6c12e807bdcace499e0701a471e8e0c
font_01_sfnt_off0003ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EA1A 10516 bytes
SHA-256: a191823884d39b4063be396cd0ff1d010d21b5a9a0d64a8e87b0871c747ffa41
font_02_sfnt_off000401fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x401FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1