Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf20dd5cb6df9933…

MALICIOUS

PDF

103.3 KB Created: 2021-06-29 01:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55ce4da2750392af233dcb61672ef98e SHA-1: 67589c3c66d2502729dd385af7667d6e6a83a33b SHA-256: cf20dd5cb6df99331d45618c6a24d6ea699dd07c04fd79af9d76c9b74189b6be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=redfoo+sorry+for+party+rocking
    • https://ajwatravel.com/wheelmarine/userfiles/file/10552053740.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297216160---jirapinotabipevorud.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a029f1104ff3c32416030e19d04831d0/58846050004.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/keduzofeduwatepifeverog.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b982aa5bd---83614645975.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/44584073407.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d916339778---85909931618.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/21287581333.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099dba6eb48f---badube.pdf
    • http://ddmlife.com/ckupload/files/46395525091.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c233af82553---2166893735.pdf
    • https://leavingcare3plus.ch/userfiles/files/totufopigedu.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/11419a71667fa0eb938c86010d1bf56a/60243940682.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/59015901206.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ppfmgs4l3gps4n3li35i7ntlv0/72888682103.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/pabetizujosexa.pdf
    • http://www.anclupnapoli.it/userfiles/file/67486159837.pdf
    • http://studiosaletta.it/userfiles/files/wezekojesusalipaxefudofe.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e71d5fbc---xibujopobisezir.pdf
    • http://madmojo.com/fckupload/file/muxetokoxuwa.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/56377668297.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000fd0e.bin
4e5cd4b60694a084e2dc4883987f2c07f00c2ca19f4e982ab30ae468acee5a1c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFD0E 26968 bytes
font_01_sfnt_off00012c46.bin
27ce09a1ab04fbef443feda2016853e67b512b7595999ceab6d2ee5a733f2d49
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 17944 bytes
font_02_sfnt_off00015baf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAF 16792 bytes
font_03_sfnt_off000173c6.bin
2bf0827dbf7bea5f3dd58e8452fb3663f6cc58e6fd7326e0543febae7ac08211
pdf-font-stream PDF embedded font (sfnt) at offset 0x173C6 11000 bytes