Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b26ced5c5570e5f…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 22:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12ea41acf355a9d19be4499bfa46cc58 SHA-1: 49b5242492076e15feae8ea92b9e6781780e1f33 SHA-256: 1b26ced5c5570e5f6a19cf689036fe26fc50d5e33d08f8dc4045f1f09862c9dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608831398af15---vejuxokupilojisow.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd600bced---tutimobefefemukapipuw.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/mofadinepina.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/05f092662c98e2bb967e40d78536dac1/87342336714.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160987d509a4aa---gerifojexidofoj.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/pobiwirububunamini.pdf
    • https://gbagencement.fr/uploads/file/16472169405.pdf
    • http://cesurmakina.com/userfiles/file/55689375568.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca160d8029---27330408209.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/al514pc2857nvebp2q1v58ofa7/92569697915.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8dbc84551---wopifo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/45f8f0bdc2082211062b239faab25bd6/juxuvazix.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03a82ccb4---muxum.pdf
    • http://bbfederico2.net/userfiles/file/77759057529.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/4c31e71683106a8dd9266ed671c44c85/13815963054.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/el7k5tpk7k7ontg38dsqhba6p4/zutofexopufekuri.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0632ded1ceac52943f9aba0cf9887157/78755700406.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/52kiqimtq69rg3ra6ilqra6s2c/rikegamigaxojanedevijaf.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2d1981ce99e28e20ad969d20fe325f8a/nakezitu.pdf
    • https://rintrans.com/files/87691717614.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/revowa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=examples+of+closed+ended+questions
    • 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_off0000e4ae.bin
89fbffc3806cb6221ae0f9bc939976572375fe3474a6f7f39027454e2bdcfff9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 16936 bytes
font_01_sfnt_off0001106f.bin
60d035060b795e0c80d25aca168d1b8a39e995f5bf09d94a6b3a06c7291b7d2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 11012 bytes
font_02_sfnt_off000129d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 16792 bytes