Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaf7d9aa9356eee…

MALICIOUS

PDF

90.1 KB Created: 2021-06-30 04:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22c453dbf04ad8927a1efb82f371f298 SHA-1: 197f200b70fbefdb162473c69ae7306f876eb2bf SHA-256: afaf7d9aa9356eeeeedf1ae2731b9e823273918309bee8f31e66005b4cff20f4
164 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://poorclarescork.ie/images/17940179718.pdf
    • http://apvn.info/userfiles/file/88627610571.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753fa4af60---golom.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160845d4dda956---pujom.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8637bd0b---nulabunikefoluzonekuzenon.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857646ae4e6---tedevuguridijuweni.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609152b24e1d9---kenowedowozuresak.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8a758812c---88288998790.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077333e5a722---64577856146.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9dda668df---wuburexav.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98c97cc63---ziletusakukapa.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pao8t8sdia3no27ch465rcff65/xufuxofibiviv.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b51274891b2---92361653241.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/naumudojvvi4j5k5d08ql5ck1e/69999453477.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800baf080da---42382209906.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/p9s5gvsek3vsftt58ckgtlsgj5/22758424929.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8b23e84ae075d23ba5f2de046556edf2/soxodanaz.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5871sg9022fkqsgpm10bbc43c1/63167979767.pdf
    • http://suachuaspa.com/upload/images-content/files/74063998906.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a311c69196eaf526a14a9e1592da9875/liwazimigenorusogi.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806121951c5---23817332186.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=photoshop+visiting+card+design
    • 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_off0000f747.bin
8d83ab7fe5fe1f95d67d64ede1ab787a89066fdf0257d0fc0a3ffa1b6a919b16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 19284 bytes
font_01_sfnt_off00012906.bin
42cb1317fc83082ab9afd63d127c2f68ed4d1c80bca763cd2c51c40fb8691f21
pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 10812 bytes
font_02_sfnt_off000141d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 16792 bytes