Malicious PDF — malware analysis report

Static analysis result for SHA-256 323a39d692614dd1…

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 19:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b5b0f0689b1bbb1c24418ff839b8dba SHA-1: 09f9874f1bf5a2679726894c1b905ae39d507417 SHA-256: 323a39d692614dd1d7e9113542becae59a64a569165a801e4c8a0019b1270f27
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to compromised websites, many of which host other PDF files. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992ada9749---botubuve.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/gepajivujetera.pdf
    • http://aostavet.it/userfiles/files/tazumadaxanopal.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b60a20eb---7931397489.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc16533b3---sowut.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pep3l3qjn40tshk54dtl7fov2s/vimowivipowalom.pdf
    • http://nesemlak.com/test/images/uploads/files/57639140945.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c1f0e5db---jewojufopazalowukitugejip.pdf
    • http://asja-doll.ru/userfiles/file/pafani.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607279d3d60bf---64345403514.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35b36783c---gubofa.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/u3j09mjpj3k219nfhkfjdkb90n/6972463812.pdf
    • https://bczenekar.hu/files/file/sufewobox.pdf
    • http://k1a.ru/images/files/file/68204184127.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c2a87486---43580977240.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070b712ce1---6964130242.pdf
    • https://mimpishio1.com/contents//files/tavebaloj.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3610148ff6---pasorarelesitami.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97cabab92---lexegunavugub.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/bilas.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/41682987060a242c63c707.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/79db2dolbr795nld83kl6g71ih/26689678077.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e450df3d---fotepumedano.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3453732---38583316514.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6c5cf6adf178e3fb7fcf2dffa185e771/54130739894.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=resident+evil+4+ultimate+hd+edition+free+download
    • 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_off0000dc26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 16792 bytes
font_01_sfnt_off0000f43d.bin
3c607252d70eec159e7d6c0803a55d8dd949c162826c6506b9fa56821b561f7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 10996 bytes
font_02_sfnt_off00010da8.bin
afb793209ad688663825e84a2f31c5668e35401e54289baa7f4256aa26f0e737
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 18992 bytes