Malicious PDF — malware analysis report

Static analysis result for SHA-256 845bff63c5975236…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 04:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07f172cbe17abd188e667356d4cac356 SHA-1: fd238b9d7f917ccd859096eda905ddbda3ee48e2 SHA-256: 845bff63c59752367e05254ef4edf8a446f81a541ea5306a674bf8a1a7a18d42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0829b8d0ad04e7255f1acd6453becbee/bebulinigifivakopugi.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5979f3c2a---58928061393.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ui77aou2q1bcd9k36gegvvel52/20729697148.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e57bb3e2---33033500333.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c3f1dd6d---7180393941.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/katobewojoxi.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/97cbb0c2f31ff786893f78a12648ded7/wolojemixiragekaxa.pdf
    • http://afgventuregroup.com/cfiles/file/bigemawer.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1tfk5m096nkq013lc60bl5kekt/8267209497.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f5a3952e---63609528949.pdf
    • https://przyklejki.pl/userfiles/jopibidojewagix.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2207a9a1---wawejelagekugulemez.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9bb27a37ac967d5970f9d2a9fc2b06d1/pajukonufekunot.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cdc9f020---gidebomenojuvefogolufujir.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h6p1qm6ipjr76gigvbeqd78us3/niranekake.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79c8996d1---45743676763.pdf
    • https://palcev.ru/userfiles/file/4690247104.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870fae9ef7c---kuzebeli.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7367416097---balobazobakeviwazow.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9ceacabe852d54fe1cec20298ddbacdc/77393537808.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/397e6bbd60bba0c69c5c7428a36bcced/9651977841.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=top+mnc+companies+in+world+2020
    • 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_off0000e577.bin
c3268258d6fc9d4234038011130c4e081c58e5d3dd23d0b32ec1b563f4043a1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10868 bytes
font_01_sfnt_off0000fe9a.bin
ea49df2db3bc951661a33eccad99d5d1d1a980f605f52b1dc14f82ea1d978463
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16848 bytes
font_02_sfnt_off00012a6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes