Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b88507c5a855d5…

MALICIOUS

PDF

96.7 KB Created: 2021-06-28 03:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 493dd9622171e9d2d889909a934b38da SHA-1: df237a3d8892701594a10307a1bc8741b76cfd2d SHA-256: a8b88507c5a855d51b238a62ed3e26eb97572297e6992c6e2f62ffe01682354f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

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://schroniskoorzechowce.pl/ckfinder/userfiles/files/5026339024.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5e04e2c0---5421286108.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074104977683---bofudonupikijomega.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae7a0f1729a94675268fe5e901700029/1066240190.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cd8aa297---872659316.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/zidedujofesosewepevazez.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/iooucavlv9c5jmhs2beg4oddl7/64211363747.pdf
    • http://loscogliodifavignana.it/userfiles/files/xuwexidal.pdf
    • https://topclassgreenery.nl/images/file/51861343982.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997edb814ff---93097460861.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xawoj.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/6osmudaje54qjv6isv2li2qehu/53514778724.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/4499670387.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba2c6b4f2---figukewofamedurefox.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee95b08396---81847067472.pdf
    • http://adaviestransportltd.com/userfiles/file/5239428868.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/62917237052.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e5f3115---xixunoled.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3910cd11b1---ledefavelamifuwuramut.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ok5lbjhc144vmh2sqt691anepb/77821985160.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3a49d0c9cb221a7a3f95b95617dcae37/joxexakozowaperozukumeloz.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e6045f531b63d59ac91caa5ebef8fcf5/76169179666.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/7a72460c18e98d075228e0241ad41ffe/95378711310.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608756e3ee195---mopimuwezisudusog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+zombies+heroes+game+mod+apk+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001556e.bin
6e46cc73f54c34e2d37436d0d95d704099af1830735fe86bf28ab6e95f26e77a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1556E 18192 bytes
font_00_sfnt_off0000eac9.bin
8e689b376e4a42dc25684a421a934ee1e5adc5ecfc0a69840b77977bffbbab37
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 11256 bytes
font_01_sfnt_off000104a5.bin
45dc772997ef57362f73a8211f89e87e0f07ad94890f2c87d3ff6a8f4991e4ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 18328 bytes
font_02_sfnt_off000134b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 16792 bytes
font_03_sfnt_off00014cc5.bin
eb4a27b1b34acaac545bdc47354f3146520cfa8dcc3a4aefc5b57c7e4393bc47
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC5 1884 bytes