Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a11707624449cf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 13:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d858d03a4bb58ba262acd512519a6ee SHA-1: d3c0b91fb91f8fa39ec2db378392ed8e672f062c SHA-256: 84a11707624449cfe80ff284cb0fb475bbe1e62d08073c45c82b49639c6c0960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are structured as link farms on disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://istanbulbalbir.com/upload/ckfinder/files/buvivexaragedurebopiw.pdf
    • http://cuatudongsaigon.net/uploads/files/37907125604.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/11e6a9465476102429bf4ebe2370acac/8774259918.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14e0e49ea---giropokadalajo.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/63c136a817f804b44093b787656be49c/vuxatosotase.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6671487f---kuviwuro.pdf
    • http://czpohledavky.cz/userfiles/files/dasefusipure.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/19f82085d697be08a94196f12b790bef/tewizexolagurogot.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b325f45b36084bd8879cc63ff874cc3b/63587008810.pdf
    • https://gamma-electronics-eg.com/userfiles/files/dojukugajazodakojemika.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/retabiririvoveri.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a78545b04ad---2767765306.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/803934be38aa42691eda1eefea2147ea/zodegitirepumopi.pdf
    • https://tungqibiotech.com/upfiles/editor/files/japutezokagewisisezeduvi.pdf
    • http://sireny.net/share/files/bowotipogi.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/82726142300.pdf
    • http://magooferta.pl/uploads/fck/file/vajazudorifumavabuliba.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/14303509515.pdf
    • https://www.casestilistas.es/ckfinder/userfiles/files/97419634810.pdf
    • http://matsusushionline.com/uploads/files/50361247627.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/209430cf2a4b47c59c2943370f617764/86862163497.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9eb885c0---kefuxatapamomitabofagu.pdf
    • http://high-keenltd.com/userfiles/file/fevemagofuzu.pdf
    • http://remont-elektro.eu/archiv/file/59124813560.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/613d4e178548248dce260f3ae40bc046/29511908345.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083817783210---riganedafajifovapudined.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=python+for+beginners+a+crash+course+guide+to+learn+python+in+1+week+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_off0000d2e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 16792 bytes
font_01_sfnt_off0000eaf3.bin
730c9b0722ba98cd363159c3933e654217f38cc0098da9cd8edd3ac90695b32f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 17464 bytes
font_02_sfnt_off000117fd.bin
ca03837737da14928c9980cb16e21a240ed02bc2e053979743774e06557d5340
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 11484 bytes