Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9b30bffdc3603c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 07:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 800b40935543d38e4fc92c25ea5f82b2 SHA-1: 81905508f3406a47d3099e94d94d32b881396306 SHA-256: 7e9b30bffdc3603c39e26d37eb88ec17d5ace18aca4a8b69eb27065326aad2da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The presence of a link farm with SEO-optimized terms like 'minecraft story download apk' suggests a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=minecraft+story+download+apk
    • https://campermagazine.tv/public/file/soturedowapojexomosonef.pdf
    • http://muzeumostrowiec.pl/obrazy/file/zumekurobe.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6ff327cfd---ruzafikego.pdf
    • http://inspeq.eu/public/files/2513955622.pdf
    • http://air-ned.com/uploads/files/datonagesimapol.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140154b556a6---1278673807.pdf
    • http://kerekagy.hu/UserFiles/file/wotizokuganupufanabaropax.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/q7051m8dlcm4f13pnac43qpe43/gobupomeji.pdf
    • https://portofcrotone.com/dati/upload/file/jijuxejudekokolem.pdf
    • http://togul.org/sites/default/files/file/71986476941.pdf
    • https://adasms.fr/userfiles/file/zokakogur.pdf
    • https://cicadit.ro/UserFiles/file/futatimubuxa.pdf
    • http://wmc21.com/ckupload/files/moxitovagedanegiligizem.pdf
    • http://karthikeyanjayaram.in/userfiles/file/48207301825.pdf
    • http://d2dgroup.net/upload/files/puduwiwepibazinovotaniw.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/suvegikosewejavokod.pdf
    • http://dichvutot99.com/webroot/img/files/lozoge.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/61201234736.pdf
    • http://asiancfea.org/userfiles/file/vimupaba.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vifivufilexumajifawojuxog.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/nugewefixosaraduno.pdf
    • https://bedandbreakfastholten.nl/userfiles/file/49320724760.pdf
    • 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_off0000ae4c.bin
a2d32cf04c74cfc04c64aaa446e50a489975591f2254edc5584c63d0f02e84b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4C 10896 bytes
font_01_sfnt_off0000c7bb.bin
380f0030e0302b5cbd82fd3d75e70ff9f2ebeb29b24bafc80e2558f7f61b8ca8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 15956 bytes
font_02_sfnt_off0000f0e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16792 bytes