Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1ced87a637fc68…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 08:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eab18e68e2c67066628f8f0686e3651 SHA-1: bb54961192f8bf251c95a4ed33a85c81ae82e4d9 SHA-256: fc1ced87a637fc68f8fb16789b067ff23a73bc0a62383dbd682c88089449dea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

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://allytemp.ru/uplcv?utm_term=catholic+rosary+prayer+for+the+dead+pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8f3afded---98696908402.pdf
    • http://mywayrtk.info/userfiles/file/96880656016.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d971869c1c---zefaxabi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c2abaeea---49453894022.pdf
    • http://randalljroutson.com/clients/44711/File/75856361402.pdf
    • https://ptogel2.com/contents//files/nusadozuxewu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/35lcgrrq1mobh5d5vd05vht07o/xomevumovebedapabo.pdf
    • http://synowka.pl/galeria/file/fuderagikewixov.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/70634833548.pdf
    • http://bioident.pl/photos_fck/file/feledizubalapazigegijawir.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/94512266807.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da18bbba7a---dewakivi.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/8f6ee2917d063ac33439156f6a35c465/xunumizezavurezit.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b28646105---35257293625.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c4fb49e3d---35448866489.pdf
    • http://pogservice.ru/userfiles/file/53403257048.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5m7kut2km78tbudc0ung6k850/duludepagoweput.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c44e03a4b7af2b0fdc49fde0aa2473a0/94866989371.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2801e22e874b12770f706ae231c9ba81/xasumixomebusuwudogumi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c560214138d904b3d96f0078846eff7f/20267245456.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeda79cf5d---rikobizepikanatovate.pdf
    • http://bestbuyfromindia.com/userfiles/file/71907281828.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/tazogulizosetukekena.pdf
    • http://falerisztika.hu/tmp/99598494442.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_off0000ec43.bin
0cbe25427fbb158e4e6d23b59e6cbb094ed0f8bd7a89de633c08d4c9bc59f5de
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 17356 bytes
font_01_sfnt_off000119a9.bin
c048dc468a14a8bda13e55d1a5b7c782f9af8bcd2073c013d709c9b1d980398c
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 10756 bytes
font_02_sfnt_off0001329b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16792 bytes