Malicious PDF — malware analysis report

Static analysis result for SHA-256 384dfa9f50681fc5…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 19:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 825bc62a5b81e7d48a36f2012106fa22 SHA-1: bb5d0faca70149237df61d96218453591613a882 SHA-256: 384dfa9f50681fc51d717d9e246e33e12ea77b40dfa39ff20d2d49c1a8621df9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malware, leveraging the 'PDF link farm' and 'compromised CMS upload link farm' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a424096f3cd---64753905117.pdf
    • http://ytbozhuo.com/upload/file/310849189725.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f7674e5eb---56501251047.pdf
    • http://aqbnb.com/uploadfile/file/pegeletonokivosefaxobegu.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/88b575b8b2f03e1187d2c41ee8ca2709/3954766086.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2c43743b075edcd825a9677e4832a910/divurufu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705e4faefb9---75065883231.pdf
    • http://sjhrz.com/images/upload/File/fibunenoseti.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c246tn7v58dc235os9jl6hm8vu/6938306022.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d5441fb3ff7e9771d3e47b8a12f714c2/munefazugese.pdf
    • http://begemot-rus.com/uploadfiles/file/2021053003030473499.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19279c024---vejewazatur.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160985b2403628---14572100264.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973f9b0d920---58421173584.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ccd3837ef---23556812436.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3bkr3h5prjfg9f78f3isj1anv4/12233312501.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2def3a0fec470925357f9864cf7b7e0f/farogudod.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c97414a1e16---vukeduzupezenem.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e5f10c1079108ae518653245f7de5cf2/88674619639.pdf
    • https://club-sports.net/uploads/products/files/nelewida.pdf
    • http://planbmedia.hu/files/56305914378.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/91224860623.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/spl43eeburts45c2pssv77mme6/65853371553.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/60b16eb205537cbe005951e1197a3669/25769679885.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=transition+metals+show+variable+oxidation+states
    • 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_off0000ec4f.bin
815b730e6c99e02fdf96befca4198df943b32ee3d57eb8bbc090356270e5fb9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 17512 bytes
font_01_sfnt_off00011ab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
font_02_sfnt_off000132c9.bin
f32f10ba98d0ea58f3a3fe4eb43744c88c3f6077cf2f370b1e9d7889727cff41
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 10868 bytes