Malicious PDF — malware analysis report

Static analysis result for SHA-256 014c13736cda62e5…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 21:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 541db48a49c2ace250d6b8074c3067cc SHA-1: 232587e5f7370949a574f4bef3c20d9e1be3e998 SHA-256: 014c13736cda62e597c678ce00eaf30712cdfa628f1d28aa3a8e11242a5d0766
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and link farms suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abd0effaa---bikediwopepirunaxifawidi.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d855f376e4---52637862194.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adac4117c3e---18903481302.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa589fa41---loneroromavelogak.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/14n53mj5rg9qks9ujk7pnanpj6/44216297124.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac50373b5---xofuzo.pdf
    • https://al-farh-iq.com/upload/userfiles/file/xoluzedaboxilog.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53d45612f---94095222727.pdf
    • https://zlatartopalovic.rs//files/lokefamibimufovefulaxov.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa1db39ade---zegafugukezerifos.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe018861b---jonagutawulenagugimesewi.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c718d1e848---vuvatezewatabez.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf48af1bc32483da99a8ff9dd01eb72a/89636523249.pdf
    • http://mid-europe-ex.com/images/blog//file/dapewumezodamumebofeziz.pdf
    • http://shinies.ru/img/lib/file/fogerekivowodudipi.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19188bb2be---monorirelegat.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/kodad.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210531025438.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6b478990d4e8bb0e34f71acf3f9dda31/jekotigavod.pdf
    • http://fotossc.pl/_files/file/zujusadufavejagalifu.pdf
    • http://fotossc.pl/_files/file/41128860912.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bec93ae49---20591823040.pdf
    • https://hnhaa.com/userfiles/tnejp//files/15242623676.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/kidikig.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c3760904---20580110791.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=projects+in+image+processing+using+matlab+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_off0000ed68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16792 bytes
font_01_sfnt_off0001057f.bin
8cff91959b5305096d4928560c36a427ce3bd6b1d32fd5738e4524245ecf9639
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 11332 bytes
font_02_sfnt_off00011fa9.bin
13c59df7cea6dab4736b31691150c992357cdf3cc7302def0627ed0c58d60ef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 17140 bytes