Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea3aac625733e8c…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 16:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d77c753a26d9298a0facfae2128a2fde SHA-1: b6bc80eafb401f2f62dd19be5c720bbdd471a0cb SHA-256: 9ea3aac625733e8cc300ce2c8f8c55758fc456030678a1e63ba9aa9aa6313252
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0e942f73---ridoxupajopufosobujagowo.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae781014e---kudawo.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6ec04bc7370d52ddeb53b8fec712389d/nofasizedusev.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9729c949---tugujabidimutokumavog.pdf
    • https://espiber.cl/images/uploadedimages/file/61014635652.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923e6ccab05---2983823355.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3ab833f7e66aee28a7f27a4b5497d0bd/lopavi.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/0jprhvcgtm427uov1eorqim287/4160723940.pdf
    • http://buildinggodskingdom.com/webcms/file/83465345734.pdf
    • https://liniagdanskzydowo.pl/files/81609973916.pdf
    • https://sayurmateng.com/contents//files/47278676767.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a987fbbe92796a905da78585264d6c51/tirategefenafopupesuxi.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc4714502---17547468006.pdf
    • https://samowar.ch/upload/file/wotulodotimavupili.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8af95d636e---51153634648.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abdac078227---11483456584.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb277c24be6---95785150330.pdf
    • https://strechybenesov.cz/content/72074358187.pdf
    • https://fcksa.com/ckfinder/userfiles/files/33284097735.pdf
    • http://pcccphucvinh.com/upload/files/8096726305.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfea01cf112---safuxejogivutavemigi.pdf
    • http://abogarestudio.com/userfiles/file/puvivuvejukiwedejebut.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3c39s949melqgpkl837hq2m1ds/85600532715.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d23dc073334---19505907817.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1e4a3fb9---649100333.pdf
    • http://alpha-th.com/userfiles/file/5573681938.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=iit+jam+mathematical+statistics+previous+year+question+paper
    • 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_off0000ee5b.bin
d153225b9929f20dfe956f56f77ace6623efe11ce0b72a95c40ee33825923c64
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 16944 bytes
font_01_sfnt_off00011ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
font_02_sfnt_off000132e9.bin
12b7f66d95ac40c50b2594a1b90a0e4daa779fcdbe5d6f6eadeecb43233a6a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 11144 bytes