Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b306ab95dbb392…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ce9121fd965da09c9473b117375b623 SHA-1: 7d87fdff3ad8ca3578395839a4e256d151ad4d8d SHA-256: b8b306ab95dbb39281d1ae44ca98ad5b07738ffb0b89a8250738dafc81c878f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to compromised websites, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to redirect users to malicious content. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5c32fbf2---maseradabefe.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/zufiwolesu.pdf
    • https://windsbs.biz/files/file/73812304814.pdf
    • http://sklepjola.pl/userfiles/file/kapezosomer.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/77586535551.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1ed1194098578c30e8501205f2e3cf61/77854960268.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/71044012927.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d6f328af5fae785e0717e2370f9744a9/2013350893.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e2804ca10f73750c22087129701dfd88/82691130933.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c738b848e56---jidotafakisusirad.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6dpkf4sv4cddunhoktm1gcs3ot/72680879254.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a394d1b3---25015369366.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913685259e3---22491796018.pdf
    • http://allasclub.com/campannas/file/398953525.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210606153839.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jrug1l1hipbjj5iat31nv4kort/lidomegolaje.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ff6182b9---zinibarowowor.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addee88b53a---nisunarazusep.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d367f3f5947cf5b9a0fa4c0a35603a6/93630473235.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0432f44c---tizilosadalute.pdf
    • http://capmar.eu/userfiles/file/sepekupinexojagibabitek.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ce005aa5---muvotaba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=intake+and+output+record+sheet
    • 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_off0000c06f.bin
eac3a0390370f8a56d1bda9565b1268a91dfa153899f0f580275bde091114621		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC06F 22032 bytes
font_01_sfnt_off0000e60d.bin
5bf17036761a8ed4948ebe18bb25a4b64f9e28ad475a504adf0fa20455bed368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 17252 bytes
font_02_sfnt_off00011248.bin
b85fe1a27f11c6e3b8becf941e65e5faf28e7e20adfd676b70126dfd90861f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 10616 bytes
font_03_sfnt_off00012a80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 16792 bytes

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