Malicious PDF — malware analysis report

Static analysis result for SHA-256 5179879e1d00d20f…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 06:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58c97588f901f4744e7953b6dbb0f884 SHA-1: a845436cebccece71ad82cbdb4bda9f03bde08fb SHA-256: 5179879e1d00d20fa93f2f2194be8d2c5252e1462119a6626ce818832bbf47b9
204 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure of a download, likely leading to a second-stage payload. ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 8

  • 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 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.
  • 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 https://medvor.ru/uplcv?utm_term=brindle+staffordshire+terrier
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d401a6800591ec0aa04ab1189e14a06d/41440121978.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80a328003---88166812304.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c4eb1fc60ac58fdebe7ec71df88e4eaa/kewegaxumigi.pdf
    • http://blpest.com/UserFiles/file/60751759380.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ec3a7ec0---wifok.pdf
    • https://ambulatorioveterinariosismondi.eu/file/73055373636.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a48d894663e---lowelu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89c70328ae---wuramakurejivuxanapu.pdf
    • https://soudurelauziere.com/upload/editor/file/fofiwupojebemazazizuzos.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086a1ca3e943---wikivipel.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc509aa90c---sexigudusizoluzan.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/11f3eb518c9d3c5fdcd7e1878fc86c9d/62599440078.pdf
    • http://hani-bee.com/userfiles/files/77832614384.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5527fa93b6---siruxafem.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6426dff05b3b8d13c9d26f67ba9b254d/pesas.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/81521488fba7ef6c4bd0e0cfca85c7f3/jabixukapevax.pdf
    • https://loyallcanada.ca/editor_files/file/81345182279.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/drelc2sqkskrbkej691bvu6rpb/23631858779.pdf
    • http://dlzj.net/upload/files/20210626092418136820.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c6750fe60f20a167f022cd278cbd198e/18557806448.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obunf6n3aov16i2r231ldovua2/burodowusowiren.pdf
    • https://accuratesearch.com/userfiles/file/8818416923.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210624_9486F4EE97590D40.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16792 bytes
font_01_sfnt_off0001132c.bin
c27dfeef37e7e7b6247a6b3ce5d627ed4dda3fba348771c02d94551e00ac7679
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 17908 bytes
font_02_sfnt_off0001411c.bin
5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 16120 bytes
font_03_sfnt_off00015670.bin
565ab9088026175795c53e6d2fde1e1a860371de85033c0450f95310da2565e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15670 10504 bytes