Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e686643ff5647b…

MALICIOUS

PDF

78.0 KB Created: 2021-06-26 02:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f717d439c0dc339cb16b31f371820f SHA-1: d4d207896b2ce70314e2f40c83665a4035df6d8f SHA-256: a8e686643ff5647b5af7a07346e307cc3c5265624113b76fe55227a55ce04828
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous compromised websites and potentially malicious URLs. The presence of multiple external URIs and link farms suggests an attempt to distribute phishing content or malware.

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 https://smidgel.ru/uplcv?utm_term=french+constitution+of+1791+pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8382c7f3---forofizugemetixojodedoji.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/783951591088790796706324e5f73c79/lateludaxorajetasi.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079080aee045---31756718032.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3cfcccb0b32cfa57be1fc3c82058ac18/70036426895.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff2da7d39---botabedudak.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739db1838c0---51901858100.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c23c7b19a65---vufesibobijukewezikowus.pdf
    • https://akapacha.com/userfiles/file/71608476702.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/da49l433b61kko8tan29rgvb84/ronemabodusovitenepi.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ojafn8pfmd6kc7llfhd6i7cu04/fofumufude.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ab84a7df647c6f7ff85c827e94adcb7f/benalikorunesinurawokuzi.pdf
    • http://adabaskimerkezi.com/upload/file/mokodofati.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6386230a---89901232083.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b5ea2075---23436087183.pdf
    • https://bosgo.mn/uploads/files/sadegaxigora.pdf
    • http://banhangcongnghe.com/upload/FCK/file/jafilasapogexolufod.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf62a3253---52771331242.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fce3018d---ribasiniluwuwomukopafita.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vhldqmdsfe1ovuqe66eq5v56bq/56522293623.pdf
    • http://sosnovgeo.ru/userfiles/file/mazuninetigexadoda.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b3db0cd2---noverot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d001.bin
7ae1eba58e067bb85ca02f0b1493ea361b2f5c2726849eec4c4df63838c95eac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 16176 bytes
font_01_sfnt_off0000f9b4.bin
3a5dff1a7d727596eeb8d6cf22dd33ad943adc5f4516c36ad4cfeaf1c50e640a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10856 bytes
font_02_sfnt_off000112d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes