Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e7b9ae227f828a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-17 22:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbbb02a1c34cd2d9ada2d2be2beeeb3b SHA-1: 50e894fa52436e04a3ebe3557c43b09a83ff3a82 SHA-256: d3e7b9ae227f828ad8941e3fa0538f865b0059bc2a2cc0571b0abbf6ae133681
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating random and compromised CMS upload links. These links point to external PDFs hosted on various domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farms are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/970cb38637dd37e4ee981b10519c06b6/balilibona.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/45225916802.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/xikisari.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe525c833---69275784080.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3ceb042b0a845bb52fb4f0f71d7c72d7/89920581274.pdfIn PDF document text
    • http://leton.pl/userfiles/file/1712391608.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bunuronefuxe.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/fifixaresabobakezolazoda.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/dedebufiv.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gokemogegewodataketirop.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/719d6069b4c87103bfa7f408843cbe1b/lujezodego.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/apd0msh6ro6ir8sku35p32gmv3/nogariwiwevinupigipajod.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/52797220813.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/d7ggo6uhp9780ejkb8c831rddm/96433043636.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jpboe5p79ndpc2mrmnktqqr2j0/tujosavaxe.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/vojizonuloluzire.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/07a93285e084ac44cb4ef19c0f8ded7e/3591694813.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/megazovagubitux.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/43960823425.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31eb07775---25633415414.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/labukotogije.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v3jav35cc5t8kelpc6lv1ecp1r/9131556416.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1e87d648a7a623e756917d9317cb67c8/sikezulamifovojezozodamez.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb1f71ff5---44365926894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=prey+trophy+guide+and+roadmapPDF 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_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10840 bytes
SHA-256: c1ec3f54f73d0a4ba2186a10950c356d2fc85a3aad7316e1f0b8fff676eb8bd1
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 17096 bytes
SHA-256: 97dc5621d0f7b7cab61b8a65ac4515e9b6bd7184c39d52b0fcd96becd3f2682f
font_02_sfnt_off00013aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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